x86/build: Move the install rule to arch/x86/Makefile

Currently, the install target in arch/x86/Makefile descends into
arch/x86/boot/Makefile to invoke the shell script, but there is no
good reason to do so.

arch/x86/Makefile can run the shell script directly.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210729140023.442101-2-masahiroy@kernel.org

arch/x86/Makefile

@@ -259,7 +259,8 @@ $(BOOT_TARGETS): vmlinux
 
 PHONY += install
 install:
-	$(Q)$(MAKE) $(build)=$(boot) $@
+	$(CONFIG_SHELL) $(srctree)/$(boot)/install.sh $(KERNELRELEASE) \
+		$(KBUILD_IMAGE) System.map "$(INSTALL_PATH)"
 
 PHONY += vdso_install
 vdso_install:

arch/x86/boot/Makefile

@@ -133,7 +133,7 @@ quiet_cmd_genimage = GENIMAGE $3
 cmd_genimage = $(BASH) $(srctree)/$(src)/genimage.sh $2 $3 $(obj)/bzImage \
 		$(obj)/mtools.conf '$(FDARGS)' $(FDINITRD)
 
-PHONY += bzdisk fdimage fdimage144 fdimage288 hdimage isoimage install
+PHONY += bzdisk fdimage fdimage144 fdimage288 hdimage isoimage
 
 # This requires write access to /dev/fd0
 # All images require syslinux to be installed; hdimage also requires
@@ -156,8 +156,3 @@ hdimage: $(imgdeps)
 isoimage: $(imgdeps)
 	$(call cmd,genimage,isoimage,$(obj)/image.iso)
 	@$(kecho) 'Kernel: $(obj)/image.iso is ready'
-
-install:
-	$(CONFIG_SHELL) $(srctree)/$(src)/install.sh \
-		$(KERNELRELEASE) $(obj)/bzImage \
-		System.map "$(INSTALL_PATH)"