[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>
diff --git a/arch/arm/mm/Makefile b/arch/arm/mm/Makefile
index cabaa3b..2d0ab19 100644
--- a/arch/arm/mm/Makefile
+++ b/arch/arm/mm/Makefile
@@ -6,7 +6,7 @@
 				   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