driver: base: Replace symbolic permissions with octal permissions

Resolve following checkpatch issue,
Replace symbolic permissions with octal permissions

Signed-off-by: Jinchao Wang <wjc@cdjrlc.com>
Link: https://lore.kernel.org/r/20210626094606.53152-1-wjc@cdjrlc.com


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>