board: samsung: refactor host programs

Some Samsung boards have their own tools under board/samsung/<board>/tools/.
This commit refactor more makefiles with "hostprogs-y".

Signed-off-by: Masahiro Yamada <yamada.m@jp.panasonic.com>
diff --git a/board/samsung/origen/Makefile b/board/samsung/origen/Makefile
index e8818bf..31e88f4 100644
--- a/board/samsung/origen/Makefile
+++ b/board/samsung/origen/Makefile
@@ -4,16 +4,16 @@
 # SPDX-License-Identifier:	GPL-2.0+
 #
 
-ifndef CONFIG_SPL_BUILD
+ifdef CONFIG_SPL_BUILD
+hostprogs-y := tools/mkorigenspl
+always := $(hostprogs-y)
+
+# omit -O2 option to suppress
+#   warning: dereferencing type-punned pointer will break strict-aliasing rules
+#
+# TODO:
+# Fix the root cause in tools/mkorigenspl.c and delete the following work-around
+$(obj)tools/mkorigenspl: HOSTCFLAGS:=$(filter-out -O2,$(HOSTCFLAGS))
+else
 obj-y	+= origen.o
 endif
-
-ifdef CONFIG_SPL_BUILD
-all: $(OBJTREE)/tools/mk$(BOARD)spl
-endif
-
-# Fix ME after we implement hostprogs-y.
-ifdef CONFIG_SPL_BUILD
-$(OBJTREE)/tools/mk$(BOARD)spl:	tools/mkv310_image.c
-	$(HOSTCC) tools/mkv310_image.c -o $(OBJTREE)/tools/mk$(BOARD)spl
-endif