uboot-tools: use $(TARGET_STRIP) for target utilities

Otherwise BR2_STRIP_xxxx setup is ignored and they are always stripped.

Signed-off-by: Carlos Santos <casantos@datacom.ind.br>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>

package/uboot-tools/uboot-tools.mk

@@ -21,6 +21,7 @@ define UBOOT_TOOLS_BUILD_CMDS
 		CROSS_COMPILE="$(TARGET_CROSS)"	\
 		CFLAGS="$(TARGET_CFLAGS)"	\
 		LDFLAGS="$(TARGET_LDFLAGS)"	\
+		STRIP=$(TARGET_STRIP)		\
 		CROSS_BUILD_TOOLS=y		\
 		CONFIG_FIT_SIGNATURE=$(BR2_PACKAGE_UBOOT_TOOLS_MKIMAGE_FIT_SIGNATURE_SUPPORT) \
 		tools-only
@@ -28,6 +29,7 @@ define UBOOT_TOOLS_BUILD_CMDS
 		CROSS_COMPILE="$(TARGET_CROSS)"	\
 		CFLAGS="$(TARGET_CFLAGS)"	\
 		LDFLAGS="$(TARGET_LDFLAGS)"	\
+		STRIP=$(TARGET_STRIP)		\
 		env no-dot-config-targets=env
 endef