arm64: defconfig: enable basic boot for Amlogic meson

Enables basic arch and serial console support for Amlogic meson family
SoCs.

Tested with Amlogic P200 and Hardkernel ODROID-C2 boards.

Signed-off-by: Kevin Hilman <khilman@baylibre.com>
Reviewed-by: Andreas Färber <afaerber@suse.de>

arch/arm64/configs/defconfig

@@ -38,6 +38,7 @@ CONFIG_ARCH_EXYNOS=y
 CONFIG_ARCH_LAYERSCAPE=y
 CONFIG_ARCH_HISI=y
 CONFIG_ARCH_MEDIATEK=y
+CONFIG_ARCH_MESON=y
 CONFIG_ARCH_MVEBU=y
 CONFIG_ARCH_QCOM=y
 CONFIG_ARCH_ROCKCHIP=y
@@ -137,6 +138,8 @@ CONFIG_SERIAL_TEGRA=y
 CONFIG_SERIAL_SH_SCI=y
 CONFIG_SERIAL_SH_SCI_NR_UARTS=11
 CONFIG_SERIAL_SH_SCI_CONSOLE=y
+CONFIG_SERIAL_MESON=y
+CONFIG_SERIAL_MESON_CONSOLE=y
 CONFIG_SERIAL_MSM=y
 CONFIG_SERIAL_MSM_CONSOLE=y
 CONFIG_SERIAL_XILINX_PS_UART=y