clk: meson: add g12a support

Add basic support for the Amlogic G12A clock controller based on
the AXG driver.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/drivers/clk/meson/Kconfig b/drivers/clk/meson/Kconfig
index 2419a30..994b44a 100644
--- a/drivers/clk/meson/Kconfig
+++ b/drivers/clk/meson/Kconfig
@@ -13,3 +13,11 @@
 	help
 	  Enable clock support for the Amlogic AXG SoC family, such as
 	  the A113X/D
+
+config CLK_MESON_G12A
+	bool "Enable clock support for Amlogic G12A"
+	depends on CLK && ARCH_MESON
+	default MESON_G12A
+	help
+	  Enable clock support for the Amlogic G12A SoC family, such as
+	  the S905X/D2