P51XX: add BOARD_NO_APSME_ATTR flag

nl80211:
The AP SME condition causes problems on driver initialization if the
NL80211_ATTR_DEVICE_AP_SME is not available.

Change-Id: I490b081fcedb695aa78a2fd93c9233d85fdb0bc0
Merge pull request #2 from omnirom/android-4.4

P51XX: add BOARD_NO_APSME_ATTR flag