clk: add Amlogic meson clock driver

Introduce a basic clock driver for Amlogic Meson SoCs which supports
enabling/disabling clock gates and getting their frequency.

Signed-off-by: Beniamino Galvani <b.galvani@gmail.com>
Signed-off-by: Neil Armstrong <narmstrong@baylibre.com>
diff --git a/arch/arm/mach-meson/Kconfig b/arch/arm/mach-meson/Kconfig
index 0350787..9a06ccc 100644
--- a/arch/arm/mach-meson/Kconfig
+++ b/arch/arm/mach-meson/Kconfig
@@ -3,6 +3,7 @@
 config MESON_GXBB
 	bool "Support Meson GXBaby"
 	select ARM64
+	select CLK
 	select DM
 	select DM_SERIAL
 	help
@@ -12,6 +13,7 @@
 config MESON_GXL
 	bool "Support Meson GXL"
 	select ARM64
+	select CLK
 	select DM
 	select DM_SERIAL
 	help