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/drivers/clk/Makefile b/drivers/clk/Makefile
index 58139b1..426c67d 100644
--- a/drivers/clk/Makefile
+++ b/drivers/clk/Makefile
@@ -9,6 +9,7 @@
 
 obj-y += tegra/
 obj-$(CONFIG_ARCH_ASPEED) += aspeed/
+obj-$(CONFIG_ARCH_MESON) += clk_meson.o
 obj-$(CONFIG_ARCH_ROCKCHIP) += rockchip/
 obj-$(CONFIG_CLK_AT91) += at91/
 obj-$(CONFIG_CLK_MVEBU) += mvebu/