nxgdb/mm: show pool expand queue size

[XuNeo]

Summary

nqueue has been added to output.

E.g.

(gdb) mm pool
Total 16 pools
                      total blocksize     bsize  overhead     nused     nfree    nifree   nwaiter    nqueue
 Umem@0x10048dc        4068        16        16         0         3       251         0         0         1
 Umem@0x100493c        4068        32        32         0         3       124         0         0         1
 Umem@0x100499c        4036        48        48         0        10        74         0         0         1
 Umem@0x10049fc        4036        64        64         0         1        62         0         0         1
 Umem@0x1004a5c           0        80        80         0         0         0         0         0         0
 Umem@0x1004abc           0        96        96         0         0         0         0         0         0
 Umem@0x1004b1c           0       112       112         0         0         0         0         0         0
 Umem@0x1004b7c           0       128       128         0         0         0         0         0         0
 Umem@0x1004bdc           0       144       144         0         0         0         0         0         0
 Umem@0x1004c3c           0       160       160         0         0         0         0         0         0
 Umem@0x1004c9c           0       176       176         0         0         0         0         0         0
 Umem@0x1004cfc           0       192       192         0         0         0         0         0         0
 Umem@0x1004d5c        3956       208       208         0         1        18         0         0         1
 Umem@0x1004dbc           0       224       224         0         0         0         0         0         0
 Umem@0x1004e1c           0       240       240         0         0         0         0         0         0
 Umem@0x1004e7c           0       256       256         0         0         0         0         0         0
(gdb)

Impact

One more column to the output message, makes it easier to inspect pool status.

Testing

Tested with qemu.

cmake -Bbuild -GNinja -DBOARD_CONFIG=mps3-an547:nsh nuttx
ninja -C build

Make sure to enable pool.

diff --git a/boards/arm/mps/mps3-an547/configs/nsh/defconfig b/boards/arm/mps/mps3-an547/configs/nsh/defconfig
index 5ffdb8ae4c9..244f0d06da7 100644
--- a/boards/arm/mps/mps3-an547/configs/nsh/defconfig
+++ b/boards/arm/mps/mps3-an547/configs/nsh/defconfig
+CONFIG_DEBUG_SYMBOLS_LEVEL="-g3"
+CONFIG_MM_HEAP_MEMPOOL_THRESHOLD=256

Run qemu:

qemu-system-arm -M mps3-an547 -m 2G -nographic -kernel build/nuttx -gdb tcp::1127

Connect to qemu and loading GDB plugin.

 gdb-multiarch build/nuttx -ex "tar rem:1127" -ex "source nuttx/tools/pynuttx/gdbinit.py"

[Jasinsky]

Minor -
Remove:
Note: Please adhere to Contributing Guidelines.
from PR description