sun6i: Add clock functions needed for SPL / DRAM init

Add clock_init_safe and clockset_pll5 functions, as these are needed for
SPL support resp. DRAM init (which is needed for SPL too).

Also add some extra clock register constant defines.

Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Acked-by: Ian Campbell <ijc@hellion.org.uk>
diff --git a/arch/arm/include/asm/arch-sunxi/prcm.h b/arch/arm/include/asm/arch-sunxi/prcm.h
index 3d3bfa6..88de1ff 100644
--- a/arch/arm/include/asm/arch-sunxi/prcm.h
+++ b/arch/arm/include/asm/arch-sunxi/prcm.h
@@ -119,6 +119,7 @@
 #define PRCM_PLL_CTRL_LDO_OUT_HV(n) \
 	__PRCM_PLL_CTRL_VDD_LDO_OUT((((n) & 0x7) * 30) + 1160)
 #define PRCM_PLL_CTRL_LDO_KEY (0xa7 << 24)
+#define PRCM_PLL_CTRL_LDO_KEY_MASK (0xff << 24)
 
 #define PRCM_CLK_1WIRE_GATE (0x1 << 31)