arm: defconfig: Enable MPROC stack for sdxlemur

Enable drivers for IPC communication with modem and aop. This includes
the SMEM, SMP2P, APCS_IPC mailbox, QMP mailbox, GLINK and QRTR drivers.

Change-Id: I5afc43023205a51f523b58b2aeb6234d131ab1d4
Signed-off-by: Chris Lew <clew@codeaurora.org>