BoardConfigCommon.mk: switch back to wpa_supplicant_8_ti

Switch back to wpa_supplicant_8_ti and enable the new
BOARD_WIFI_SKIP_CAPABILITIES-flag to provide a TI-optimized
wpa_supplicant and working hostapd.

Change-Id: I3904be7ef6f1a78060fb7bc2002348959c1a6b69