ARM: configs: qcom_defconfig: Enable APCS IPC mailbox driver

Enable Qualcomm APCS IPC mailbox driver for IPC communication between
application processor and other masters in platforms like SDX55.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Link: https://lore.kernel.org/r/20210408170930.91834-2-manivannan.sadhasivam@linaro.org


Signed-off-by: Bjorn Andersson <bjorn.andersson@linaro.org>