Disable linux-firmware zstd compression

[sairon]

Disable downstream option for linux-firmware compression. With #3877 it's not needed for x86 anymore and other boards don't need it. Eventually the higher EROFS compression for firmwares and modules can be enabled for other targets as well.

Summary by CodeRabbit

• Chores
  • Removed firmware compression functionality—including the Zstandard compression method—from multiple platform configurations.
  • Firmware packages continue to be included in builds, ensuring consistent firmware support while streamlining build processes.

[coderabbitai]

📝 Walkthrough

Walkthrough

Multiple Buildroot configuration files have been updated to remove Linux firmware compression options. In each defconfig file, the options for enabling firmware compression and for using Zstandard (ZSTD) compression have been removed while leaving the rest of the firmware configuration unchanged.

Changes

File(s)	Change Summary
buildroot-external/configs/*_defconfig (e.g., generic_aarch64, green, khadas_vim3, odroid_, ova, rpi, tinker, yellow)	Removed Linux firmware compression options: BR2_PACKAGE_LINUX_FIRMWARE_COMPRESS and BR2_PACKAGE_LINUX_FIRMWARE_COMPRESS_ZSTD.

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📜 Recent review details

Configuration used: CodeRabbit UI
Review profile: CHILL
Plan: Pro

📥 Commits

Reviewing files that changed from the base of the PR and between bdcc2b9 and e1a272c.

📒 Files selected for processing (18)

• buildroot-external/configs/generic_aarch64_defconfig (0 hunks)
• buildroot-external/configs/green_defconfig (0 hunks)
• buildroot-external/configs/khadas_vim3_defconfig (0 hunks)
• buildroot-external/configs/odroid_c2_defconfig (0 hunks)
• buildroot-external/configs/odroid_c4_defconfig (0 hunks)
• buildroot-external/configs/odroid_m1_defconfig (0 hunks)
• buildroot-external/configs/odroid_m1s_defconfig (0 hunks)
• buildroot-external/configs/odroid_n2_defconfig (0 hunks)
• buildroot-external/configs/odroid_xu4_defconfig (0 hunks)
• buildroot-external/configs/ova_defconfig (0 hunks)
• buildroot-external/configs/rpi2_defconfig (0 hunks)
• buildroot-external/configs/rpi3_64_defconfig (0 hunks)
• buildroot-external/configs/rpi3_defconfig (0 hunks)
• buildroot-external/configs/rpi4_64_defconfig (0 hunks)
• buildroot-external/configs/rpi4_defconfig (0 hunks)
• buildroot-external/configs/rpi5_64_defconfig (0 hunks)
• buildroot-external/configs/tinker_defconfig (0 hunks)
• buildroot-external/configs/yellow_defconfig (0 hunks)

💤 Files with no reviewable changes (18)

• buildroot-external/configs/ova_defconfig
• buildroot-external/configs/odroid_c4_defconfig
• buildroot-external/configs/odroid_c2_defconfig
• buildroot-external/configs/yellow_defconfig
• buildroot-external/configs/odroid_m1_defconfig
• buildroot-external/configs/rpi4_defconfig
• buildroot-external/configs/rpi3_defconfig
• buildroot-external/configs/tinker_defconfig
• buildroot-external/configs/green_defconfig
• buildroot-external/configs/odroid_n2_defconfig
• buildroot-external/configs/rpi5_64_defconfig
• buildroot-external/configs/khadas_vim3_defconfig
• buildroot-external/configs/rpi4_64_defconfig
• buildroot-external/configs/rpi2_defconfig
• buildroot-external/configs/rpi3_64_defconfig
• buildroot-external/configs/odroid_m1s_defconfig
• buildroot-external/configs/generic_aarch64_defconfig
• buildroot-external/configs/odroid_xu4_defconfig

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