msm: memshare: heap sharing between APSS and Modem

MPSS does the handshake operation with kernel QMI service
which interacts with APSS. The Heap Sharing driver implements
a kernel QMI service in LA_APSS, which is responsible for
providing contiguous physical memory to MPSS when modem
requires additional memory.

Change-Id: Ic769c5ca17a5cfd8e8cf4ff08c731a0266977e19
Signed-off-by: Katish Paran <kparan@codeaurora.org>