perf tools: Clean 'generated' directory used for creating the syscall table on x86

Remove generated directory tools/perf/arch/x86/include/generated.
Signed-off-by: Andreas Wendleder <andreas.wendleder@gmail.com>
Tested-by: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: http://lore.kernel.org/lkml/20210301185642.163396-1-gonsolo@gmail.comSigned-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

tools/perf/arch/x86/Makefile

@@ -10,10 +10,11 @@ PERF_HAVE_JITDUMP := 1
 # Syscall table generation
 #
 
-out    := $(OUTPUT)arch/x86/include/generated/asm
-header := $(out)/syscalls_64.c
-sys    := $(srctree)/tools/perf/arch/x86/entry/syscalls
-systbl := $(sys)/syscalltbl.sh
+generated := $(OUTPUT)arch/x86/include/generated
+out       := $(generated)/asm
+header    := $(out)/syscalls_64.c
+sys       := $(srctree)/tools/perf/arch/x86/entry/syscalls
+systbl    := $(sys)/syscalltbl.sh
 
 # Create output directory if not already present
 _dummy := $(shell [ -d '$(out)' ] || mkdir -p '$(out)')
@@ -22,6 +23,6 @@ $(header): $(sys)/syscall_64.tbl $(systbl)
 	$(Q)$(SHELL) '$(systbl)' $(sys)/syscall_64.tbl 'x86_64' > $@
 
 clean::
-	$(call QUIET_CLEAN, x86) $(RM) $(header)
+	$(call QUIET_CLEAN, x86) $(RM) -r $(header) $(generated)
 
 archheaders: $(header)