Blackfin: rename bootm.c to boot.c

The boot file contains functions for more than just "bootm", so rename it
accordingly.

Signed-off-by: Mike Frysinger <vapier@gentoo.org>

lib_blackfin/Makefile

@@ -37,7 +37,7 @@ SOBJS-y	+= memmove.o
 SOBJS-y	+= memset.o
 
 COBJS-y	+= board.o
-COBJS-y	+= bootm.o
+COBJS-y	+= boot.o
 COBJS-y	+= cache.o
 COBJS-y	+= muldi3.o
 COBJS-y	+= post.o

lib_blackfin/boot.c

@@ -1,5 +1,5 @@
 /*
- * U-boot - bootm.c - misc boot helper functions
+ * U-boot - boot.c - misc boot helper functions
  *
  * Copyright (c) 2005-2008 Analog Devices Inc.
  *