fix: 去掉冗余的strip操作

toybox源码编译时，默认会进行strip操作，如下步骤：

//third_party/toybox/scripts/make.sh:340:
! do_loudly ${CROSS_COMPILE}${STRIP} "$UNSTRIPPED" -o "$OUTNAME"

因此在打包的Makefile中再进行STRIP操作是冗余的。

close #I43767

Change-Id: I10a9861b682eb8e556b7af7519c9109eef0b3a94
Signed-off-by: Guangyao Ma <guangyao.ma@outlook.com>

apps/toybox/Makefile

@@ -50,7 +50,6 @@ endif
 	LDFLAGS="--target=$(LLVM_TARGET) $(LLVM_SYSROOT)" \
 	make -C $(BUILD_DIR) toybox -j> $(BUILD_LOG) 2>&1
 	$(HIDE)$(CP) $(BUILD_DIR)/$(TOYBOX) .
-	$(HIDE)$(STRIP) $(TOYBOX)
 	$(HIDE)mkdir -p $(APPS_OUT)
 	$(HIDE)$(CP) $(TOYBOX) $(APPS_OUT)