net: qrtr: haven: Add memory sharing support

The carved out or allocated memory may not be configured to be
accessible by both the owner and consumer vms. Add support to share
memory through hyp_assign_phy() and assign a label to the resultant
memparcel through hh_rm_mem_qcom_lookup_sgl().

This sharing sequence should only be done by the owner of the reserved
memory region. Currently we indicate this with the qcom,master tag in
device tree.

Change-Id: Iff9539f00dc3591b79352d87c1fd6fc91cbc0c6a
Signed-off-by: Chris Lew <clew@codeaurora.org>