arch/powerpc/boot/addRamDisk.c: Mark several internal functions static

Nothing outside of arch/powerpc/boot/addRamDisk.c references the
functions "get4k", "put4k", or "death".
Signed-off-by: NJosh Triplett <josh@joshtriplett.org>

arch/powerpc/boot/addRamDisk.c

@@ -58,7 +58,7 @@ static int check_elf64(void *p, int size, struct addr_range *r)
 
 	return 64;
 }
-void get4k(FILE *file, char *buf )
+static void get4k(FILE *file, char *buf )
 {
 	unsigned j;
 	unsigned num = fread(buf, 1, 4096, file);
@@ -66,12 +66,12 @@ void get4k(FILE *file, char *buf )
 		buf[j] = 0;
 }
 
-void put4k(FILE *file, char *buf )
+static void put4k(FILE *file, char *buf )
 {
 	fwrite(buf, 1, 4096, file);
 }
 
-void death(const char *msg, FILE *fdesc, const char *fname) 
+static void death(const char *msg, FILE *fdesc, const char *fname)
 {
 	fprintf(stderr, msg);
 	fclose(fdesc);