drm/radeon: use pattern rule to avoid code duplication in Makefile

This Makefile repeats similar build rules. Use a pattern rule.
Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/radeon/Makefile

@@ -9,34 +9,7 @@ targets := rn50_reg_safe.h r100_reg_safe.h r200_reg_safe.h rv515_reg_safe.h r300
 quiet_cmd_mkregtable = MKREGTABLE $@
       cmd_mkregtable = $(obj)/mkregtable $< > $@
 
-$(obj)/rn50_reg_safe.h: $(src)/reg_srcs/rn50 $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/r100_reg_safe.h: $(src)/reg_srcs/r100 $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/r200_reg_safe.h: $(src)/reg_srcs/r200 $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/rv515_reg_safe.h: $(src)/reg_srcs/rv515 $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/r300_reg_safe.h: $(src)/reg_srcs/r300 $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/r420_reg_safe.h: $(src)/reg_srcs/r420 $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/rs600_reg_safe.h: $(src)/reg_srcs/rs600 $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/r600_reg_safe.h: $(src)/reg_srcs/r600 $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/evergreen_reg_safe.h: $(src)/reg_srcs/evergreen $(obj)/mkregtable FORCE
-	$(call if_changed,mkregtable)
-
-$(obj)/cayman_reg_safe.h: $(src)/reg_srcs/cayman $(obj)/mkregtable FORCE
+$(obj)/%_reg_safe.h: $(src)/reg_srcs/% $(obj)/mkregtable FORCE
 	$(call if_changed,mkregtable)
 
 $(obj)/r100.o: $(obj)/r100_reg_safe.h $(obj)/rn50_reg_safe.h