neuron: ch_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,primary tag in
device tree.

Change-Id: Idf5658ab4cf0d1c022f6b919914a8e782318c8d7
Signed-off-by: Chris Lew <clew@codeaurora.org>