clk: sunxi: Add Allwinner R40 CLK driver

Add initial clock driver for Allwinner R40.

- Implement USB bus and USB clocks via ccu_clk_gate
  for R40, so it can accessed in common clk enable
  and disable functions from clk_sunxi.c
- Implement USB bus and USB resets via ccu_reset table
  for R40, so it can accessed in common reset deassert
  and assert functions from reset-sunxi.c

Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
diff --git a/drivers/clk/sunxi/Kconfig b/drivers/clk/sunxi/Kconfig
index 90af70d..c45a4ba 100644
--- a/drivers/clk/sunxi/Kconfig
+++ b/drivers/clk/sunxi/Kconfig
@@ -44,6 +44,13 @@
 	  This enables common clock driver support for platforms based
 	  on Allwinner A83T SoC.
 
+config CLK_SUN8I_R40
+	bool "Clock driver for Allwinner R40"
+	default MACH_SUN8I_R40
+	help
+	  This enables common clock driver support for platforms based
+	  on Allwinner R40 SoC.
+
 config CLK_SUN8I_H3
 	bool "Clock driver for Allwinner H3/H5"
 	default MACH_SUNXI_H3_H5