Makefile: Clean up old targets

Some of these targets seem to come from a long time ago. Now just
rm -rf $(obj) is all that is needed for a clean.

Change-Id: Iccc62b3c54ee2a074c25674715403c1457f6aad3
Signed-off-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/63117
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Elyes Haouas <ehaouas@noos.fr>
Reviewed-by: Martin Roth <martinroth@google.com>

Makefile

@@ -470,10 +470,10 @@ doxyclean: doxygen-clean
 doxygen-clean:
 	rm -rf $(DOXYGEN_OUTPUT_DIR)
 
-clean-for-update: doxygen-clean clean-for-update-target
+clean-for-update: doxygen-clean
 	rm -rf $(obj) .xcompile
 
-clean: clean-for-update clean-target clean-utils
+clean: clean-for-update clean-utils clean-payloads
 	rm -f .ccwrap
 
 clean-cscope:

Makefile.inc

@@ -676,19 +676,6 @@ decompressor-y += $(CONFIG_MEMLAYOUT_LD_FILE)
 clean-abuild:
 	rm -rf coreboot-builds
 
-clean-for-update-target: clean-payloads
-	rm -f $(obj)/ramstage?* $(obj)/coreboot.romstage $(obj)/coreboot.pre* $(obj)/coreboot.bootblock $(obj)/coreboot.a
-	rm -rf $(obj)/bootblock?* $(obj)/romstage?* $(obj)/location.*
-	rm -f $(obj)/option_table.* $(obj)/crt0.S $(obj)/ldscript
-	rm -f $(obj)/mainboard/$(MAINBOARDDIR)/static.c $(obj)/mainboard/$(MAINBOARDDIR)/config.py $(obj)/mainboard/$(MAINBOARDDIR)/static.dot
-	rm -f $(obj)/mainboard/$(MAINBOARDDIR)/crt0.s $(obj)/mainboard/$(MAINBOARDDIR)/crt0.disasm
-	rm -f $(obj)/mainboard/$(MAINBOARDDIR)/romstage.inc
-	rm -f $(obj)/mainboard/$(MAINBOARDDIR)/bootblock.* $(obj)/dsdt.*
-	rm -f $(obj)/cpu/x86/smm/smm_bin.c $(obj)/cpu/x86/smm/smm.* $(obj)/cpu/x86/smm/smm
-
-clean-target:
-	rm -f $(obj)/coreboot*
-
 #######################################################################
 # Development utilities
 printcrt0s: