bsp: k230: eliminate warnings for kconfig #6044

Job	Run time
generate-matrix	5s
RT-Thread Online Packages (STM32F407 RT-Spark)	6m 36s
others_ft32_mm32_acm32	8m 13s
RTduino_Arduino Libraries (Raspberry Pico)	5m 48s
nxp_renesas	4m 17s
gd32_n32_apm32	3m 29s
stm32f0_f1	4m 3s
RTduino_Arduino Libraries (STM32F412 Nucleo)	6m 18s
at32_hc32_ht32	3m 38s
nuvoton	3m 37s
stm32_f7_g0_h7_mp15_u5_h5_wb5	7m 29s
stm32_f2_f4	11m 0s
Infineon_TI_microchip	5m 29s
stm32l4	8m 27s
aarch64	17m 49s
mips	1m 10s
riscv-none	1m 25s
K230	1m 32s
llvm-arm	4m 23s
riscv64-unknown	2m 2s
ESP32C3	6m 58s
arm-none-bsp-smart	2m 10s
i386-unknown	42s
hpmicro	55s
nordic(yml)	7m 3s
simulator	1m 3s
collect-artifacts	0s
	2h 5m 41s

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