wil6210: convert symbolic permissions to octal permissions

Symbolic permissions are no longer recommended.
This patch changes the symbolic permissions in wil6210 driver
to octal permissions.

Change-Id: I4d762724938a6c615698ea92bd668f0b4ee6963c
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 78484c44e4b305b23cbfcfb9257ed96c8753e86d
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


Signed-off-by: Maya Erez <merez@codeaurora.org>