wifi.c: allow devices to specify driver delay

This is necessary on the Samsung smdk4210 tablets. Without
the delay, it takes roughly 30 seconds to enable wifi.

Change-Id: I6a3419e66958fc72ae60e5294f52124b1180d752
wifi: support adding p2p0 when starting wpa_supplicant

For TI wlan chips in p2p mode we need this omapzoom cherry-pick
to start p2p0 correctly.

http://www.omapzoom.org/?p=platform/hardware/libhardware_legacy.git;a=commit;h=ccb4c24db795059f1df365d313d80c6b269bc55e
By: Arik Nemtsov <arik@wizery.com>
On: Tue, 31 Jul 2012 21:21:20

Original commit description:
Add p2p0 using an NL80211 command when wpa_supplicant is started, and
p2p_supported is enabled.

Change-Id: Ibc0ad138513f024672642cc5764a81510aa38625
Signed-off-by: Hashcode <hashcode0f@gmail.com>
wifi: remove p2p interface on supplicant stop

remove p2p interface on wpa_supplicant stop
so next time it is started it won't fail when trying
to create p2p again

Change-Id: I7a4c5e9a82a013afc75548d175d5850d67fcd927
wlan: Fix for improper comparison of driver_status string

This commit ensures driver load failure status is compared with
valid string which has the failure/success information.

Change-Id: I3b619ad0c005fb793d127bd2a23b376ed961d0b7
CRs-Fixed: 652539
wifi: avoid crash when no phy's are found

Exit gracefully when no phy's are found.

Change-Id: I8c1f57e60bb63b52d8cb086e1a25d8d5b33f03f0
Signed-off-by: Vishal Mahaveer <vishalm@ti.com>
Merge "wifi: avoid crash when no phy's are found" into android-4.4
power: Add DVFS stub

Change-Id: I23837ff88a0a7b23474348b6fe8eee15cfe91e10