staging: hikey9xx: change spaces to tabs

Fix the following type of checkpatch error:
"ERROR: code indent should use tabs where possible"
Signed-off-by: Atul Gopinathan <leoatul12@gmail.com>
Link: https://lore.kernel.org/r/20210209081935.3084-1-leoatul12@gmail.comSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>