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

drivers/leds/blink/Kconfig

 config LEDS_BCM63138
 	tristate "LED Support for Broadcom BCM63138 SoC"
 	depends on LEDS_CLASS
-	depends on ARCH_BCM4908 || ARCH_BCM_5301X || BCM63XX || COMPILE_TEST
+	depends on ARCH_BCMBCA || ARCH_BCM_5301X || BCM63XX || COMPILE_TEST
 	depends on HAS_IOMEM
 	depends on OF
-	default ARCH_BCM4908
+	default ARCH_BCMBCA
 	help
 	  This option enables support for LED controller that is part of
 	  BCM63138 SoC. The same hardware block is known to be also used