ARM: dts: msm: Update the memory map for 8996

The size of the modem memory region has been increased to 98MB.  Update
the memory map in the device tree to reflect the size increase as well
as the shift in base address of the peripheral_mem region above it.

Change-Id: Ic042eda4ba14c4b2866ab10d4582d91f7218369d
Signed-off-by: Mitchel Humpherys <mitchelh@codeaurora.org>