Makefile: Move CONFIG_TOOLS_DEBUG check to later

At present this is checked before the config has been loaded by the
Makefile, so it doesn't work.

Move the check to later.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
diff --git a/Makefile b/Makefile
index e9882c6..888dd1b 100644
--- a/Makefile
+++ b/Makefile
@@ -278,7 +278,7 @@
 HOSTCC       = cc
 HOSTCXX      = c++
 KBUILD_HOSTCFLAGS   := -Wall -Wstrict-prototypes -O2 -fomit-frame-pointer \
-		$(if $(CONFIG_TOOLS_DEBUG),-g) $(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
+		$(HOST_LFS_CFLAGS) $(HOSTCFLAGS)
 KBUILD_HOSTCXXFLAGS := -O2 $(HOST_LFS_CFLAGS) $(HOSTCXXFLAGS)
 KBUILD_HOSTLDFLAGS  := $(HOST_LFS_LDFLAGS) $(HOSTLDFLAGS)
 KBUILD_HOSTLDLIBS   := $(HOST_LFS_LIBS) $(HOSTLDLIBS)
@@ -735,6 +735,8 @@
 KBUILD_AFLAGS += $(KAFLAGS)
 KBUILD_CFLAGS += $(KCFLAGS)
 
+KBUILD_HOSTCFLAGS += $(if $(CONFIG_TOOLS_DEBUG),-g)
+
 # Use UBOOTINCLUDE when you must reference the include/ directory.
 # Needed to be compatible with the O= option
 UBOOTINCLUDE    := \