serial: sifive: select by default if SOC_SIFIVE

With the aim of dropping direct selects of drivers from Kconfig.socs,
default the SiFive serial drivers to the value of SOC_SIFIVE.

Signed-off-by: Conor Dooley <conor.dooley@microchip.com>
Link: https://lore.kernel.org/r/20221005171348.167476-3-conor@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/tty/serial/Kconfig

@@ -958,6 +958,7 @@ config SERIAL_OMAP_CONSOLE
 config SERIAL_SIFIVE
 	tristate "SiFive UART support"
 	depends on OF
+	default SOC_SIFIVE
 	select SERIAL_CORE
 	help
 	  Select this option if you are building a kernel for a device that
@@ -967,6 +968,7 @@ config SERIAL_SIFIVE
 config SERIAL_SIFIVE_CONSOLE
 	bool "Console on SiFive UART"
 	depends on SERIAL_SIFIVE=y
+	default SOC_SIFIVE
 	select SERIAL_CORE_CONSOLE
 	select SERIAL_EARLYCON
 	help