i.MX28: Move SPL to arch/arm/cpu/arm926ejs/mx28

This moves SPL to common location so it can be reused by multiple boards. Also,
this commit adjusts M28 SoM to avoid breakage due to the move.

Signed-off-by: Marek Vasut <marek.vasut@gmail.com>
Cc: Wolfgang Denk <wd@denx.de>
Cc: Detlev Zundel <dzu@denx.de>
Cc: Stefano Babic <sbabic@denx.de>
diff --git a/board/denx/m28evk/Makefile b/board/denx/m28evk/Makefile
index b6f002f..aa16c7d 100644
--- a/board/denx/m28evk/Makefile
+++ b/board/denx/m28evk/Makefile
@@ -27,10 +27,8 @@
 
 ifndef	CONFIG_SPL_BUILD
 COBJS	:= m28evk.o
-endif
-
-ifdef	CONFIG_SPL_BUILD
-COBJS	:= mem_init.o mmc_boot.o power_init.o memsize.o
+else
+COBJS	:= spl_boot.o
 endif
 
 SRCS	:= $(COBJS:.o=.c)
@@ -41,11 +39,6 @@
 
 all:	$(ALL)
 
-ifdef	CONFIG_SPL_BUILD
-memsize.c:
-	ln -sf $(TOPDIR)/common/memsize.c $@
-endif
-
 #########################################################################
 
 # defines $(obj).depend target