ARM: multi_v7_defconfig: enable UniPhier UART driver

The UniPhier on-chip UART driver was merged into the mainline by
commit 1a8d2903 ("serial: 8250_uniphier: add UniPhier serial
driver").

Enable it from multi_v7_defconfig.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Signed-off-by: Olof Johansson <olof@lixom.net>

arch/arm/configs/multi_v7_defconfig

@@ -251,6 +251,7 @@ CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_8250_DW=y
 CONFIG_SERIAL_8250_EM=y
 CONFIG_SERIAL_8250_MT6577=y
+CONFIG_SERIAL_8250_UNIPHIER=y
 CONFIG_SERIAL_AMBA_PL011=y
 CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
 CONFIG_SERIAL_ATMEL=y