pm: cpupower: Clean up bindings gitignore

Add SPDX identifier to the gitignore. Remove the comment and .i file
since the file it references was removed in another patch. This patch
depends on Min-Hua Chen's 'pm: cpupower: rename raw_pylibcpupower.i'.

Signed-off-by: John B. Wyatt IV <[email protected]>
Signed-off-by: John B. Wyatt IV <[email protected]>
Signed-off-by: Shuah Khan <[email protected]>

Author: John B. Wyatt IV

tools/power/cpupower/bindings/python/.gitignore

@@ -1,8 +1,7 @@
+# SPDX-License-Identifier: GPL-2.0-only
 __pycache__/
 raw_pylibcpupower_wrap.c
 *.o
 *.so
 *.py
 !test_raw_pylibcpupower.py
-# git keeps ignoring this file, use git add -f raw_libcpupower.i
-!raw_pylibcpupower.i