bus: mhi: ep: Do not allocate memory for MHI objects from DMA zone

MHI endpoint stack accidentally started allocating memory for objects from
DMA zone since commit 62210a26 ("bus: mhi: ep: Use slab allocator
where applicable"). But there is no real need to allocate memory from this
naturally limited DMA zone. This also causes the MHI endpoint stack to run
out of memory while doing high bandwidth transfers.

So let's switch over to normal memory.

Cc: <stable@vger.kernel.org> # 6.8
Fixes: 62210a26 ("bus: mhi: ep: Use slab allocator where applicable")
Reviewed-by: Mayank Rana <quic_mrana@quicinc.com>
Link: https://lore.kernel.org/r/20240603164354.79035-1-manivannan.sadhasivam@linaro.org


Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>