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>
diff --git a/board/BuS/eb_cpux9k2/cpux9k2.c b/board/BuS/eb_cpux9k2/cpux9k2.c
index a918b04..856d798 100644
--- a/board/BuS/eb_cpux9k2/cpux9k2.c
+++ b/board/BuS/eb_cpux9k2/cpux9k2.c
@@ -141,7 +141,7 @@
 
 int dram_init(void)
 {
-	gd->ram_size = get_ram_size((volatile long *)CONFIG_SYS_SDRAM_BASE,
+	gd->ram_size = get_ram_size((long *)CONFIG_SYS_SDRAM_BASE,
 			CONFIG_SYS_SDRAM_SIZE);
 	return 0;
 }