drm/msm: remove python 3.9 dependency for compiling msm

Since commit 5acf491 ("drm/msm: import gen_header.py script from Mesa"),
compilation is broken on machines having python versions older than 3.9
due to dependency on argparse.BooleanOptionalAction.

Switch to use simple bool for the validate flag to remove the dependency.

Fixes: 5acf491 ("drm/msm: import gen_header.py script from Mesa")
Signed-off-by: Abhinav Kumar <[email protected]>
Tested-by: Douglas Anderson <[email protected]>
Reviewed-by: Dmitry Baryshkov <[email protected]>
Signed-off-by: Thierry Reding <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

Author: Abhinav Kumar

drivers/gpu/drm/msm/registers/gen_header.py

@@ -538,7 +538,7 @@ def add_all_usages(self, reg, usages):
 		self.variants.add(reg.domain)
 
 	def do_validate(self, schemafile):
-		if self.validate == False:
+		if not self.validate:
 			return
 
 		try:
@@ -948,7 +948,8 @@ def main():
 	parser = argparse.ArgumentParser()
 	parser.add_argument('--rnn', type=str, required=True)
 	parser.add_argument('--xml', type=str, required=True)
-	parser.add_argument('--validate', action=argparse.BooleanOptionalAction)
+	parser.add_argument('--validate', default=False, action='store_true')
+	parser.add_argument('--no-validate', dest='validate', action='store_false')
 
 	subparsers = parser.add_subparsers()
 	subparsers.required = True