ARM: dts: msm: Allocate memory for diag client for SDM630

This patch enables allocation of 5MB for new diag client
of memshare.

CRs-Fixed: 1107794
Change-Id: Ibfbd9c2fc13860b647c1411e6c60f4a543683993
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>