accel/ivpu: Force snooping for MMU writes

Set AW_SNOOP_OVERRIDE bit in VPU_37/40XX_HOST_IF_TCU_PTW_OVERRIDES
to force snooping for MMU write accesses (setting event queue events).

MMU event queue buffer is the only buffer written by MMU and
mapped as write-back which break cache coherency. Force write
transactions to be snooped solving the problem.

Signed-off-by: Wachowski, Karol <[email protected]>
Signed-off-by: Jacek Lawrynowicz <[email protected]>
Reviewed-by: Jeffrey Hugo <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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