netd: add support for legacy hostapd

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

Conflicts:
	Android.mk
	SoftapController.cpp

(cherry picked from commit 6655df84fd4c8b819acbf420b5836d021cca587b)

Change-Id: Ida16e806fe00ed99a205293f24af917975b3909f
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 e29d61b9a996a54557c2c61e8b4d26c195f7e96b)

Change-Id: I77ea74d9bfa72646463401842b402717b13ca471