msm: Add support for multiple memory holes

If a target supports multiple memory holes, the base address and
size of the memory holes are represented as an array of tuples.
The device tree is scanned in order to extract these values and
remove the memory.

Change-Id: Id253112a384b7f64be067636e5bffc69e3950fb5
Signed-off-by: Neeti Desai <neetid@codeaurora.org>