[MIPS] make mdesc and prom_getmdesc() static

Neither the mdesc[] array nor the prom_getmdesc() function need to
be global. This patch makes them static.

Successfully build-tested using default configs for Malta, Atlas
and SEAD boards.

Runtime test successfully performed by booting the Malta 4Kc board
up to the shell prompt.
Signed-off-by: Dmitri Vorobiev <dmitri.vorobiev@gmail.com>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>

arch/mips/mips-boards/generic/memory.c

@@ -37,7 +37,7 @@ enum yamon_memtypes {
 	yamon_prom,
 	yamon_free,
 };
-struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
+static struct prom_pmemblock mdesc[PROM_MAX_PMEMBLOCKS];
 
 #ifdef DEBUG
 static char *mtypes[3] = {
@@ -50,7 +50,7 @@ static char *mtypes[3] = {
 /* determined physical memory size, not overridden by command line args  */
 unsigned long physical_memsize = 0L;
 
-struct prom_pmemblock * __init prom_getmdesc(void)
+static struct prom_pmemblock * __init prom_getmdesc(void)
 {
 	char *memsize_str;
 	unsigned int memsize;