rb532: increase kernel partition

4.1 got little bit larger than 4MB and I couldn't get lzma loader
working on this platform

Signed-off-by: Roman Yeryomin <roman@advem.lv>

SVN-Revision: 47970

target/linux/rb532/image/Makefile

@@ -72,7 +72,7 @@ define Image/Build
 	$(CP) $(KDIR)/vmlinux.elf $(BIN_DIR)/$(IMG_PREFIX)-$(1).kernel
 	$(STAGING_DIR_HOST)/bin/patch-cmdline $(BIN_DIR)/$(IMG_PREFIX)-$(1).kernel '$(strip $(call Image/cmdline/$(1))) '
 	./gen_image.sh $(BIN_DIR)/$(IMG_PREFIX)-combined-$(1).bin \
-		4 $(BIN_DIR)/$(IMG_PREFIX)-$(1).kernel \
+		5 $(BIN_DIR)/$(IMG_PREFIX)-$(1).kernel \
 		$(CONFIG_TARGET_ROOTFS_PARTSIZE) $(KDIR)/root.$(1) \
 		128
 endef