tty: serial: bcm63xx: use more precise Kconfig symbol

Patches lowering SERIAL_BCM63XX dependencies led to a discussion and
documentation change regarding "depends" usage. Adjust Kconfig entry to
match current guidelines. Make this symbol available for relevant
architectures only.

Cc: Geert Uytterhoeven <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Acked-by: Florian Fainelli <[email protected]>
Signed-off-by: Rafał Miłecki <[email protected]>
Ref: f35a07f ("tty: serial: bcm63xx: lower driver dependencies")
Ref: 18084e4 ("Documentation/kbuild: Document platform dependency practises")
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Greg Kroah-Hartman <[email protected]>

Author: Rafał Miłecki

drivers/tty/serial/Kconfig

@@ -1100,7 +1100,8 @@ config SERIAL_TIMBERDALE
 config SERIAL_BCM63XX
 	tristate "Broadcom BCM63xx/BCM33xx UART support"
 	select SERIAL_CORE
-	depends on COMMON_CLK
+	depends on ARCH_BCM4908 || ARCH_BCM_63XX || BCM63XX || BMIPS_GENERIC || COMPILE_TEST
+	default ARCH_BCM4908 || ARCH_BCM_63XX || BCM63XX || BMIPS_GENERIC
 	help
 	  This enables the driver for the onchip UART core found on
 	  the following chipsets: