defconfig: sa2150: remove atheros 802.11ac wireless cards support

The wireless adapters based on Atheros IEEE 802.11ac family of
chipsets are not used on sa2150p based telematics products
therefore these drivers are removed.

Change-Id: Ie5242a0bf4e52e608c64c9cd6719491c4e56b73e
Signed-off-by: Rishi Gupta <rishgupt@codeaurora.org>