* Memory reservations for MSM targets

Large contiguous allocations (generally sizes greater than 64KB) must be
allocated from a carved out memory pool. The size of the carved out pools
is based on the sizes drivers need. To properly size the pools, devices
must specify the size and type of the memory needed. Any driver wanting to
allocate contiguous memory should indicate this via device tree bindings:

Required parameters:
- qcom,memory-reservation-type: type of memory to be reserved. This is a
string defined in arch/arm/mach-msm/memory.c
- qcom,memory-reservation-size: size of memory to be reserved

Example:

	qcom,a-driver {
		compatible = "qcom,a-driver";
		qcom,memory-reservation-type = "EBI1" /* reserve EBI memory */
		qcom,memory-reservation-size = <0x400000>; /* size 4MB */
	};

Under some circumstances, it may be necessary to remove a chunk of memory
from the kernel completely using memblock remove. Note this is different
than adjusting the memory tags passed in via the bootloader as the virtual
range is not affected. Any driver needing to remove a block of memory should
add the appropriate binding:

Required parameters:
- qcom,memblock-remove: base and size of block to be removed

	qcom,a-driver {
		compatible = "qcom,a-driver";
		/* Remove 4MB at 0x200000*/
		qcom,memblock-remove = <0x200000 0x400000>;
	};

In order to ensure memory is only reserved when a driver is actually enabled,
drivers are required to add EXPORT_COMPAT(<name of compatible string>) some
where in the driver. For the examples above, the driver must add
EXPORT_COMPAT("qcom,a-driver") to the driver, similar to EXPORT_SYMBOL.
The EXPORT_COMPAT is to ensure that memory is only carved out if the
driver is actually enabled, otherwise the memory will not be used.

Add bindings for memory reservations
msm: Add bindings for memory reservations

To get large contiguous memory allocations, a dedicated carved out
memory pool is created. The size of this pool is determined by the
sizes declared by devices. Add size bindings so drivers can increase
the size needed for reservations. Also add bindings to allow drivers
to reserve memory with memblock_reserve to reserve specific memory
regions.

Change-Id: Icc51aef5069a7964c03c5c52f24e40b96f4b2781
Signed-off-by: Laura Abbott <e7b4910f4742918f5926c991d8a2cd122ac7e295@codeaurora.org>
