Replace "FLASH" strings with "Flash" or "flash"

There's no compelling reason to have the output on bootup or the
"flinfo" command print "flash" in uppercase, so use the proper case
where appropriate.

Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
diff --git a/arch/powerpc/lib/board.c b/arch/powerpc/lib/board.c
index 9759e23..b88cf6b 100644
--- a/arch/powerpc/lib/board.c
+++ b/arch/powerpc/lib/board.c
@@ -717,7 +717,7 @@
 	mem_malloc_init (malloc_start, TOTAL_MALLOC_LEN);
 
 #if !defined(CONFIG_SYS_NO_FLASH)
-	puts ("FLASH: ");
+	puts ("Flash: ");
 
 	if (board_flash_wp_on()) {
 		printf("Uninitialized - Write Protect On\n");