Accelerometer: Fix initial garbage on CLK

CS was triggered before the SPI was
enabled on the MCU,
resulting in the CLK pin floating for a while.

The accelerometer was ignoring the first command,
which resulted in the "not detected" error.

BFW-6057

src/hw/SparkFunLIS2DH.cpp

@@ -149,6 +149,10 @@ LIS2DHCore::LIS2DHCore(const buddy::hw::OutputPin &chip_sel_pin)
 }
 
 status_t LIS2DHCore::beginCore(void) {
+    // Enable SPI now -> make sure the clock is not floating before we do ChipSelect
+    // BFW-6057
+    __HAL_SPI_ENABLE(&SPI_HANDLE_FOR(accelerometer));
+
     // Check the ID register to determine if we have an accelerometer
     uint8_t readCheck;
     readRegister(&readCheck, LIS2DH_WHO_AM_I);