ARM64: dts: meson-axg: add the SPICC controller

Add DT info for the SPICC controller which found in
the Amlogic's Meson-AXG SoC.

Signed-off-by: Sunny Luo <sunny.luo@amlogic.com>
Signed-off-by: Yixun Lan <yixun.lan@amlogic.com>
Reviewed-by: Neil Armstrong <narmstrong@baylibre.com>
Signed-off-by: Kevin Hilman <khilman@baylibre.com>