Remove volatile qualifier in get_ram_size() calls

Checkpatch.pl complains about the volatile qualifier in calls to
get_ram_size(). Remove this qualifier in the prototype and in the
calls where it is useless, and leave it only in the function body
where it is needed.

Signed-off-by: Albert ARIBAUD <albert.u.boot@aribaud.net>

include/common.h

@@ -317,7 +317,7 @@ const char *symbol_lookup(unsigned long addr, unsigned long *caddr);
 void	api_init (void);
 
 /* common/memsize.c */
-long	get_ram_size  (volatile long *, long);
+long	get_ram_size  (long *, long);
 
 /* $(BOARD)/$(BOARD).c */
 void	reset_phy     (void);