target: mdm9615: add support for new mem tag node
target: mdm9615: add support for new mem tag node

Change to add new mem tag node to pass 128MB extra memory
to hlos starting from second bank base.

Change-Id: I4807dfbc0639fb043e154572a47a1a78e4e7886b

Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk,Foxda-Tech/polaris-bootable-bootloader-lk