common: Move some cache and MMU functions out of common.h

These functions belong in cpu_func.h. Another option would be cache.h
but that code uses driver model and we have not moved these cache
functions to use driver model. Since they are CPU-related it seems
reasonable to put them here.

Move them over.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/nds32/cpu/n1213/ae3xx/cpu.c b/arch/nds32/cpu/n1213/ae3xx/cpu.c
index c5a7a3f..a53bed1 100644
--- a/arch/nds32/cpu/n1213/ae3xx/cpu.c
+++ b/arch/nds32/cpu/n1213/ae3xx/cpu.c
@@ -15,6 +15,7 @@
 /* CPU specific code */
 #include <common.h>
 #include <command.h>
+#include <cpu_func.h>
 #include <watchdog.h>
 #include <asm/cache.h>
 
diff --git a/arch/nds32/cpu/n1213/ag101/cpu.c b/arch/nds32/cpu/n1213/ag101/cpu.c
index c9cb433..34443b5 100644
--- a/arch/nds32/cpu/n1213/ag101/cpu.c
+++ b/arch/nds32/cpu/n1213/ag101/cpu.c
@@ -15,6 +15,7 @@
 /* CPU specific code */
 #include <common.h>
 #include <command.h>
+#include <cpu_func.h>
 #include <watchdog.h>
 #include <asm/cache.h>
 
diff --git a/arch/nds32/lib/cache.c b/arch/nds32/lib/cache.c
index 2706513..e11d300 100644
--- a/arch/nds32/lib/cache.c
+++ b/arch/nds32/lib/cache.c
@@ -6,6 +6,7 @@
  */
 
 #include <common.h>
+#include <cpu_func.h>
 #if !(CONFIG_IS_ENABLED(SYS_ICACHE_OFF) && CONFIG_IS_ENABLED(SYS_DCACHE_OFF))
 static inline unsigned long CACHE_SET(unsigned char cache)
 {