MIPS: ath79: add support for the Qualcomm Atheros AP136-010 board

Also enable the board in the default configuration.

Cc: Rodriguez, Luis <rodrigue@qca.qualcomm.com>
Cc: Giori, Kathy <kgiori@qca.qualcomm.com>
Cc: QCA Linux Team <qca-linux-team@qca.qualcomm.com>
Signed-off-by: Gabor Juhos <juhosg@openwrt.org>
Patchwork: http://patchwork.linux-mips.org/patch/4953/


Signed-off-by: John Crispin <blogic@openwrt.org>