common: Make sure arch-specific map_sysmem() is defined

In the case where the arch defines a custom map_sysmem(), make sure that
including just mapmem.h is sufficient to have these functions as they
are when the arch does not override it.

Also split the non-arch specific functions out of common.h

Signed-off-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Glass <sjg@chromium.org>

common/lcd.c

@@ -15,6 +15,7 @@
 #include <linux/types.h>
 #include <stdio_dev.h>
 #include <lcd.h>
+#include <mapmem.h>
 #include <watchdog.h>
 #include <asm/unaligned.h>
 #include <splash.h>