CRIS: Remove 'TOPDIR' from Makefiles

This patch removes TOPDIR from Cris Makefiles.

Cc: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Cc: Andreas Schwab <schwab@suse.de>
Signed-off-by: WANG Cong <xiyou.wangcong@gmail.com>
Signed-off-by: Sam Ravnborg <sam@ravnborg.org>
Acked-by: Jesper Nilsson <jesper.nilsson@axis.com>

arch/cris/arch-v32/boot/compressed/Makefile

@@ -7,7 +7,7 @@
 target = $(target_compressed_dir)
 src    = $(src_compressed_dir)
 
-CC = gcc-cris -mlinux -march=v32 -I $(TOPDIR)/include
+CC = gcc-cris -mlinux -march=v32 $(LINUXINCLUDE)
 CFLAGS = -O2
 LD = gcc-cris -mlinux -march=v32 -nostdlib
 OBJCOPY = objcopy-cris