TI: add DMABUF_CARVEOUT custom allocator support for decoder

In 48 bits mode, the wave5 video decoder/encoder has a hardware limitation:

For each memory access, the upper 16 bits of the 48 bit address *must* be
identical.

In order to enforce this addressing limitation, we can use a different dmabuf
heap, named carveout[1].

Add support for the carveout heap allocator in plugin_store and make sure that
this allocator is used by default for all input buffers.

Note: the output allocator still uses gralloc.
This requires a custom gralloc implementation which uses the carveout heap
whenever the GRALLOC_USAGE_HW_VIDEO_{DECODER,ENCODER} flags are used.

To tell the c2 framework that this allocator is available, make sure to set the
c2-poolmask property:

    debug.stagefright.c2-poolmask=0x1f50000

(DMABUF_CARVEOUT is bit 24)

[1] https://git.ti.com/cgit/ti-linux-kernel/ti-linux-kernel/tree/drivers/dma-buf/heaps/carveout-heap.c?h=ti-linux-6.1.y


Signed-off-by: Mattijs Korpershoek <mkorpershoek@baylibre.com>