riscv: Check that vdso does not contain any dynamic relocations

Like other architectures, use the common cmd_vdso_check to make sure of
that.

Signed-off-by: Alexandre Ghiti <alexghiti@rivosinc.com>
Tested-by: Vladimir Isaev <vladimir.isaev@syntacore.com>
Signed-off-by: Björn Töpel <bjorn@rivosinc.com>

arch/riscv/kernel/vdso/Makefile

@@ -49,7 +49,7 @@ $(obj)/vdso.o: $(obj)/vdso.so
 
 # link rule for the .so file, .lds has to be first
 $(obj)/vdso.so.dbg: $(obj)/vdso.lds $(obj-vdso) FORCE
-	$(call if_changed,vdsold)
+	$(call if_changed,vdsold_and_check)
 LDFLAGS_vdso.so.dbg = -shared -S -soname=linux-vdso.so.1 \
 	--build-id=sha1 --hash-style=both --eh-frame-hdr
 
@@ -69,7 +69,8 @@ include/generated/vdso-offsets.h: $(obj)/vdso.so.dbg FORCE
 # actual build commands
 # The DSO images are built using a special linker script
 # Make sure only to export the intended __vdso_xxx symbol offsets.
-quiet_cmd_vdsold = VDSOLD  $@
-      cmd_vdsold = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \
+quiet_cmd_vdsold_and_check = VDSOLD  $@
+      cmd_vdsold_and_check = $(LD) $(ld_flags) -T $(filter-out FORCE,$^) -o $@.tmp && \
                    $(OBJCOPY) $(patsubst %, -G __vdso_%, $(vdso-syms)) $@.tmp $@ && \
-                   rm $@.tmp
+                   rm $@.tmp && \
+                   $(cmd_vdso_check)