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/arm/lib/board.c b/arch/arm/lib/board.c
index 96c0e30..c620d2c 100644
--- a/arch/arm/lib/board.c
+++ b/arch/arm/lib/board.c
@@ -481,7 +481,7 @@
 	mem_malloc_init (malloc_start, TOTAL_MALLOC_LEN);
 
 #if !defined(CONFIG_SYS_NO_FLASH)
-	puts ("FLASH: ");
+	puts ("Flash: ");
 
 	if ((flash_size = flash_init ()) > 0) {
 # ifdef CONFIG_SYS_FLASH_CHECKSUM