ath5k: Increase PHY settling parameters for turo mode

 * On turbo mode increase PHY settling times, note that
 we only increase switch settling time on AR5212 as indicated
 by initvals.

 * A few cleanups: Move frame control settings for AR5210 from
 reset_tx_queue to tweak_initvals and remove phy_scal settings
 from tweak_initvals (we tweak them alread on set_sleep_clock).

 Signed-off-by: Nick Kossifidis <mickflemm@gmail.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>