wil6210: restore power save state after internal FW reset

The power save profile is set to default state in case of FW reset,
regardless of the state before the reset took place.
Fix this by saving the current power save profile and restore it
in case of FW reset.

Change-Id: I9bcf8c4a60b72851631e25bf33a8335cffb2644f
Signed-off-by: Lazar Alexei <qca_ailizaro@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 8b068c032a5cbe6f80168e0ecf2c9625c8d14d90
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


[merez@codeaurora.org: fix trivial merge conflicts]
Signed-off-by: Maya Erez <merez@codeaurora.org>