ARM: dts: msm: Add memshare for msmgold

Memshare driver allocates and share the memory with the clients
sitting on modem so that they can use it. Add device tree
information for memshare driver for msmgold.

Change-Id: If0ae7201e80775f51ac6e8a5e2a8f98e951dcece
Signed-off-by: Katish Paran <kparan@codeaurora.org>