clk: sunxi: Add Allwinner A31 CLK driver

Add initial clock driver for Allwinner A31.

- Implement USB ahb1 and USB clocks via ccu_clk_gate table
  for A31, so it can accessed in common clk enable and disable
  functions from clk_sunxi.c
- Implement USB ahb1 and USB resets via ccu_reset table
  for A31, 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 b228c2f..535b0dc 100644
--- a/drivers/clk/sunxi/Kconfig
+++ b/drivers/clk/sunxi/Kconfig
@@ -23,6 +23,13 @@
 	  This enables common clock driver support for platforms based
 	  on Allwinner A10s/A13 SoC.
 
+config CLK_SUN6I_A31
+	bool "Clock driver for Allwinner A31/A31s"
+	default MACH_SUN6I
+	help
+	  This enables common clock driver support for platforms based
+	  on Allwinner A31/A31s SoC.
+
 config CLK_SUN8I_H3
 	bool "Clock driver for Allwinner H3/H5"
 	default MACH_SUNXI_H3_H5