ARM: meson: update multi_v7_defconfig

This patch updates the multi_v7_defconfig with the CONFIG_* needed by
the just added Meson anch. It also adds a new defconfig specifically for
the Meson SoCs.
Signed-off-by: Carlo Caione <carlo@caione.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>

arch/arm/configs/multi_v7_defconfig

@@ -29,6 +29,7 @@ CONFIG_ARCH_HISI=y
 CONFIG_ARCH_HI3xxx=y
 CONFIG_ARCH_HIX5HD2=y
 CONFIG_ARCH_KEYSTONE=y
+CONFIG_ARCH_MESON=y
 CONFIG_ARCH_MXC=y
 CONFIG_SOC_IMX51=y
 CONFIG_SOC_IMX53=y
@@ -177,6 +178,8 @@ CONFIG_SERIAL_8250_CONSOLE=y
 CONFIG_SERIAL_8250_DW=y
 CONFIG_SERIAL_AMBA_PL011=y
 CONFIG_SERIAL_AMBA_PL011_CONSOLE=y
+CONFIG_SERIAL_MESON=y
+CONFIG_SERIAL_MESON_CONSOLE=y
 CONFIG_SERIAL_SAMSUNG=y
 CONFIG_SERIAL_SAMSUNG_CONSOLE=y
 CONFIG_SERIAL_SIRFSOC=y