mailbox: apcs-ipc: Add support for sm8150

The qcom-apcs-ipc-mailbox driver maps the apps
register to trigger interrupts to remote subsystems. This
change adds the correct configuration for sm8150.

Change-Id: Ie49285b5bdb1c0767b67d162585f09260665e72d
Signed-off-by: Santosh Dronamraju <sdronamr@codeaurora.org>