Create @SystemApi wrapper for ICarrierMessagingService.

CarrierMessagingService lives outside telephony mainline module
so the communication with it cannot be over AIDL. Other option was
to include CarrierMessagingService in telephony mainline module, but
MmsService uses it too.

Test: basic messaging sanity
Bug: 143609473
Merged-in: I02ea608dc66f637f9dc984f4dcd8346fcc4b80ce
Change-Id: I02ea608dc66f637f9dc984f4dcd8346fcc4b80ce
(cherry picked from commit 86989efe)