ARM: dts: msm: Add shared memory access device for msm8994

Add the device tree entry for the memory heaps that need
to be unlocked, to allow client access on msm8994.

Change-Id: Ib68a105507d00ecd030bea139d618585692c4736
Signed-off-by: Neeti Desai <neetid@codeaurora.org>