davinci: Remove unwanted memsize.c from hawkboard's nand spl build

dram_init function in board/davinci/common/misc.c does not get
compiled for spl builds, thus rendering inclusion of memsize.c
useless.

Signed-off-by: Sughosh Ganu <urwithsughosh@gmail.com>

nand_spl/board/davinci/da8xxevm/Makefile

@@ -46,7 +46,6 @@ COBJS	= cpu.o \
 	da850_pinmux.o \
 	div0.o \
 	hawkboard_nand_spl.o \
-	memsize.o \
 	misc.o \
 	nand_boot.o \
 	ns16550.o \
@@ -140,11 +139,6 @@ $(obj)psc.c:
 	@rm -f $@
 	ln -s $(TOPDIR)/arch/arm/cpu/arm926ejs/davinci/psc.c $@
 
-# from common directory
-$(obj)memsize.c:
-	@rm -f $@
-	ln -s $(TOPDIR)/common/memsize.c $@
-
 #########################################################################
 
 $(obj)%.o:	$(obj)%.S