soc: qcom: smem: Support to parse smem host id

The current implementation will use hard coded
smem host id which will cause conflicts when gvm
want to communicate with remote sub system through
new smem partition area.

Adding support to parse smem host id from dt entry.
This will help to configure unique smem host id for
gvm which needs direct communication with different
sub system.

Change-Id: I49865968d24a3979c766a006b16e44099a5cbd7f
Signed-off-by: Arun Prakash <app@codeaurora.org>