Update Linux to v5.4.2

Change-Id: Idf6911045d9d382da2cfe01b1edff026404ac8fd
diff --git a/arch/arm/tools/Makefile b/arch/arm/tools/Makefile
index ddb89a7..27d8beb 100644
--- a/arch/arm/tools/Makefile
+++ b/arch/arm/tools/Makefile
@@ -35,8 +35,7 @@
 
 quiet_cmd_gen_mach = GEN     $@
       cmd_gen_mach = mkdir -p $(dir $@) && \
-		     $(AWK) -f $(filter-out $(PHONY),$^) > $@ || \
-		     { rm -f $@; /bin/false; }
+		     $(AWK) -f $(filter-out $(PHONY),$^) > $@
 
 $(kapi)/mach-types.h: $(src)/gen-mach-types $(src)/mach-types FORCE
 	$(call if_changed,gen_mach)