Fix HardFault due to uninitialized SPIDriver in BRD4187C NCP build and unrecognized symbols in BRD4186C NCP Build

[Pervin Korino Dasan A (korino-silabs)]

Porting of PR #244

Copy Description of #244

BRD4187

Problem

A hard fault occurred because the UART driver attempted to dereference an uninitialized UART driver handle.

Change Overview

Added a call to sl_spidrv_init_instances() based on the initialization code generated by SLC. This ensures that the required driver instances are initialized before they are used.

Testing

Validated by building for thread
Validated the change on the BRD4187C NCP Lock application by:

• Building the application successfully
• Commissioning the device
• Issuing cluster commands and verifying expected behavior

BRD4186C

Problem

FAILED: [code=1] matter-silabs-lock-example.out 
arm-none-eabi-g++ -T../../../../examples/lock-app/silabs/third_party/connectedhomeip/examples/platform/silabs/ldscripts/efr32mg24.ld -Wl,--defsym -Wl,SILABS_WIFI=1 -march=armv8-m.main+dsp -mcpu=cortex-m33 -mabi=aapcs -mfpu=fpv5-sp-d16 -mfloat-abi=hard -mthumb -Og --specs=nosys.specs --specs=nano.specs -Werror -Wl,--fatal-warnings -fdiagnostics-color -Wl,--gc-sections -Wl,--as-needed -fno-lto -Wl,--no-warn-rwx-segment -Wl,--wrap=MemoryAlloc -Wl,--wrap=_malloc_r -Wl,--wrap=_realloc_r -Wl,--wrap=_free_r -Wl,--wrap=_calloc_r -Wl,--wrap=main @./matter-silabs-lock-example.out.rsp -o ./matter-silabs-lock-example.out
/home/pe1/Development/connectedhomeip/.environment/cipd/packages/arm/bin/../lib/gcc/arm-none-eabi/12.2.1/../../../../arm-none-eabi/bin/ld: obj/third_party/connectedhomeip/third_party/silabs/matter_support/board-support/efr32/efr32mg24/BRD4186C/autogen/sdk.sl_event_handler.c.o: in function `sli_stack_permanent_allocation':
/home/pe1/Development/connectedhomeip/out/wifi/BRD4186C/SiWx917/../../../../examples/lock-app/silabs/third_party/connectedhomeip/third_party/silabs/matter_support/board-support/efr32/efr32mg24/BRD4186C/autogen/sl_event_handler.c:61: undefined reference to `sli_bt_stack_permanent_allocation'
/home/pe1/Development/connectedhomeip/.environment/cipd/packages/arm/bin/../lib/gcc/arm-none-eabi/12.2.1/../../../../arm-none-eabi/bin/ld: /home/pe1/Development/connectedhomeip/out/wifi/BRD4186C/SiWx917/../../../../examples/lock-app/silabs/third_party/connectedhomeip/third_party/silabs/matter_support/board-support/efr32/efr32mg24/BRD4186C/autogen/sl_event_handler.c:62: undefined reference to `sl_ot_rtos_perm_allocation'
collect2: error: ld returned 1 exit status
ninja: build stopped: subcommand failed.

Change Overview

Fixed by Adding gaurds for BLE/OT stacks based on BRD4187C for BRD4186C

Testing

Validated by building for both Thread and with NCP