leds: bcm63138: Rename dependency symbol ARCH_BCM4908 to ARCH_BCMBCA

Symbol ARCH_BCM4908 has been merged/removed without updating leds
Kconfig.

Fixes: dd5c672d ("arm64: bcmbca: Merge ARCH_BCM4908 to ARCH_BCMBCA")
Signed-off-by: Rafał Miłecki <rafal@milecki.pl>
Reviewed-by: William Zhang <william.zhang@broadcom.com>
Link: https://lore.kernel.org/r/20230714063214.3791-1-zajec5@gmail.com


Signed-off-by: Lee Jones <lee@kernel.org>