[ARM] Rename mm-armv.c to pgd.c

mm-armv.c now only contains the pgd allocation/freeing code, so
rename it to have a more sensible filename.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

arch/arm/mm/Makefile

@@ -6,7 +6,7 @@ obj-y				:= consistent.o extable.o fault.o init.o \
 				   iomap.o
 
 obj-$(CONFIG_MMU)		+= fault-armv.o flush.o ioremap.o mmap.o \
-				   mm-armv.o mmu.o
+				   pgd.o mmu.o
 
 ifneq ($(CONFIG_MMU),y)
 obj-y				+= nommu.o

arch/arm/mm/pgd.c

@@ -1,13 +1,11 @@
 /*
- *  linux/arch/arm/mm/mm-armv.c
+ *  linux/arch/arm/mm/pgd.c
  *
  *  Copyright (C) 1998-2005 Russell King
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License version 2 as
  * published by the Free Software Foundation.
- *
- *  Page table sludge for ARM v3 and v4 processor architectures.
  */
 #include <linux/mm.h>
 #include <linux/highmem.h>