[source] build: add image command for installing zImage file.

[LEDE Commits]

blogic pushed a commit to source.git, branch master:
https://git.lede-project.org/feb1907270622f094a54ef23a20e8991908eca25

commit feb1907270622f094a54ef23a20e8991908eca25
Author: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun at microchip.com>
AuthorDate: Wed Sep 13 11:51:14 2017 -0700

    build: add image command for installing zImage file.
    
    Signed-off-by: Sandeep Sheriker Mallikarjun <sandeepsheriker.mallikarjun at microchip.com>
---
 include/image-commands.mk | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/include/image-commands.mk b/include/image-commands.mk
index 2aac8fb..acf25d6 100644
--- a/include/image-commands.mk
+++ b/include/image-commands.mk
@@ -114,6 +114,11 @@ define Build/install-dtb
 	)
 endef
 
+define Build/install-zImage
+    $(CP) $(KDIR)/zImage \
+      $(BIN_DIR)/$(IMG_PREFIX)-$(PROFILE_SANITIZED)-zImage
+endef
+
 define Build/fit
 	$(TOPDIR)/scripts/mkits.sh \
 		-D $(DEVICE_NAME) -o $@.its -k $@ \