netd: workaround to skip wifi fw reload

Implements BOARD_WLAN_NO_FWRELOAD, needed for some drivers that
do not support firmware reload (such as ar6000/ath6kl).

(cherry picked from commit 042870889a60b195227e5bc887d67f1490087715)

Conflicts:
	Android.mk

Change-Id: Ibd350c9b1de24d644d198310532288493a6f7b33
netd: add support for legacy hostapd

Implements BOARD_HAVE_LEGACY_HOSTAPD, to avoid passing
"ieee80211n=1" to hostapd config.

Conflicts:
	Android.mk

Change-Id: Icf4e94c3d62ba25aa6d651048b6c7db59126efdc
Re-add legacy soft-ap for kitkat (2/2)

Change-Id: Id057c36751a18b678cad5eb1680f615be84ef96d