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/Makefile b/drivers/clk/meson/Makefile
index 47a5ad5..c873d69 100644
--- a/drivers/clk/meson/Makefile
+++ b/drivers/clk/meson/Makefile
@@ -5,4 +5,5 @@
 
 obj-$(CONFIG_CLK_MESON_GX) += gxbb.o
 obj-$(CONFIG_CLK_MESON_AXG) += axg.o
+obj-$(CONFIG_CLK_MESON_G12A) += g12a.o