sw64: vdso: adapt to the upstream changes in vdso_install

Fix it according to upstream commit 56769ba ("kbuild: unify
vdso_install rules").

Signed-off-by: Gu Zitao <guzitao@wxiat.com>
Reviewed-by: He Sheng <hesheng@wxiat.com>
Signed-off-by: Gu Zitao <guzitao@wxiat.com>
(cherry picked from commit e98d2e7)

Author: Gu Zitao

arch/sw_64/Makefile

@@ -49,9 +49,7 @@ export LIBS_Y
 
 boot := arch/sw_64/boot
 
-PHONY += vdso_install
-vdso_install:
-	$(Q)$(MAKE) $(build)=arch/sw_64/kernel/vdso $@
+vdso-install-y += arch/sw_64/vdso/vdso.so.dbg
 
 #Default target when executing make with no arguments
 all: $(boot)/vmlinux.bin.gz

arch/sw_64/kernel/vdso/Makefile

@@ -69,14 +69,3 @@ quiet_cmd_vdsold = VDSOLD  $@
 # that contains the same symbols at the same offsets.
 quiet_cmd_so2s = SO2S    $@
       cmd_so2s = $(NM) -D $< | $(srctree)/$(src)/so2s.sh > $@
-
-# install commands for the unstripped file
-quiet_cmd_vdso_install = INSTALL $@
-      cmd_vdso_install = cp $(obj)/$@.dbg $(MODLIB)/vdso/$@
-
-vdso.so: $(obj)/vdso.so.dbg
-	@mkdir -p $(MODLIB)/vdso
-	$(call cmd,vdso_install)
-
-
-vdso_install: vdso.so