[ARM] Make 'i' and 'zi' targets work

The 'i' and 'zi' targets short-circuit the dependencies for
'install' and 'zinstall' targets; these are useful for
installing the kernel on platforms which have make but no
compiler installed.
Signed-off-by: NRussell King <rmk+kernel@arm.linux.org.uk>

arch/arm/boot/Makefile

@@ -91,4 +91,12 @@ zinstall: $(obj)/zImage
 	$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
 	$(obj)/zImage System.map "$(INSTALL_PATH)"
 
+zi:
+	$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
+	$(obj)/zImage System.map "$(INSTALL_PATH)"
+
+i:
+	$(CONFIG_SHELL) $(srctree)/$(src)/install.sh $(KERNELRELEASE) \
+	$(obj)/Image System.map "$(INSTALL_PATH)"
+
 subdir-	    := bootp compressed