genksyms: remove Makefile hack

This workaround was introduced for suppressing the reduce/reduce conflict
warnings because the %expect-rr directive, which is applicable only to GLR
parsers, cannot be used for genksyms.

Since there are no longer any conflicts, this Makefile hack is now
unnecessary.

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Acked-by: Nicolas Schier <n.schier@avm.de>

Author: masahir0y

scripts/genksyms/Makefile

@@ -4,24 +4,6 @@ hostprogs-always-y	+= genksyms
 
 genksyms-objs	:= genksyms.o parse.tab.o lex.lex.o
 
-# FIXME: fix the ambiguous grammar in parse.y and delete this hack
-#
-# Suppress shift/reduce, reduce/reduce conflicts warnings
-# unless W=1 is specified.
-#
-# Just in case, run "$(YACC) --version" without suppressing stderr
-# so that 'bison: not found' will be displayed if it is missing.
-ifeq ($(findstring 1,$(KBUILD_EXTRA_WARN)),)
-
-quiet_cmd_bison_no_warn = $(quiet_cmd_bison)
-      cmd_bison_no_warn = $(YACC) --version >/dev/null; \
-			  $(cmd_bison) 2>/dev/null
-
-$(obj)/pars%.tab.c $(obj)/pars%.tab.h: $(src)/pars%.y FORCE
-	$(call if_changed,bison_no_warn)
-
-endif
-
 # -I needed for generated C source to include headers in source tree
 HOSTCFLAGS_parse.tab.o := -I $(src)
 HOSTCFLAGS_lex.lex.o := -I $(src)