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>

include/configs/sun6i.h

@@ -14,6 +14,7 @@
 /*
  * A31 specific configuration
  */
+#define CONFIG_CLK_FULL_SPEED		1008000000
 
 #define CONFIG_SYS_PROMPT		"sun6i# "