utils: rkisp1: gen-csc-table.py: Don't presume python3 location

The python3 binary may be present in a location other than /usr/bin/.
Use /usr/bin/env to locate it.

Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Daniel Scally <dan.scally@ideasonboard.com>

utils/rkisp1/gen-csc-table.py

@@ -1,4 +1,4 @@
-#!/usr/bin/python3
+#!/usr/bin/env python3
 # SPDX-License-Identifier: GPL-2.0-or-later
 # Copyright (C) 2022, Ideas on Board Oy
 #