ARM: dts: msm: Allocate memory for diag client for MSM8953

The patch enables allocation of 5MB for new diag client
of memshare and marks the diag client guaranteed.

Change-Id: If53b5f3fd7f2fb7ac2b3daf78fb65c1e23f88b06
Signed-off-by: Manoj Prabhu B <bmanoj@codeaurora.org>