firmware: imx: select SOC_BUS to fix firmware build

Fix build error in firmware/imx/ selecting SOC_BUS.

riscv32-linux-ld: drivers/firmware/imx/imx-scu-soc.o: in function `.L9':
imx-scu-soc.c:(.text+0x1b0): undefined reference to `soc_device_register'

Fixes: edbee09 ("firmware: imx: add SCU firmware driver support")
Signed-off-by: Randy Dunlap <[email protected]>
Reported-by: kernel test robot <[email protected]>
Cc: Atish Patra <[email protected]>
Cc: Palmer Dabbelt <[email protected]>
Cc: Ard Biesheuvel <[email protected]>
Cc: Anson Huang <[email protected]>
Cc: Daniel Baluta <[email protected]>
Reviewed-by: Dong Aisheng <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

Author: rddunlap

drivers/firmware/imx/Kconfig

@@ -13,6 +13,7 @@ config IMX_DSP
 config IMX_SCU
 	bool "IMX SCU Protocol driver"
 	depends on IMX_MBOX
+	select SOC_BUS
 	help
 	  The System Controller Firmware (SCFW) is a low-level system function
 	  which runs on a dedicated Cortex-M core to provide power, clock, and