ARM: dts: msm: Update the IPA IMEM region for sdmmagpie

Correct the IPA IMEM region values for sdmmagpie target as
per hardware recommended values.

Change-Id: I39c8095ca49d4ce55dcad1f58b53230a4739556c
Acked-by: Ashok Vuyyuru <avuyyuru@qti.qualcomm.com>
Signed-off-by: Mohammed Javid <mjavid@codeaurora.org>