wil6210: move pre-FW configuration to separate function

Re-arrange the code to have dedicated function for device configuration
which takes place before FW starts running.

Change-Id: Ia0f2b33f85ba9547bee9415e34143e5b09e28447
Signed-off-by: Dedy Lansky <qca_dlansky@qca.qualcomm.com>
Signed-off-by: Maya Erez <qca_merez@qca.qualcomm.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
Git-commit: 1490846d256af947a4743f04ba8c97dc3bc37073
Git-repo: git://git.kernel.org/pub/scm/linux/kernel/git/kvalo/ath.git


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