drm/i915/mtl: Disable stolen memory backed FB for A0

Stolen memory is not usable for MTL A0 stepping beyond
certain access size and we have no control over userspace
access size of /dev/fb which can be backed by stolen memory.
So disable stolen memory backed fb by setting i915->dsm.usable_size
to zero.

v2: remove hsdes reference and fix commit message(Andi)
v3: use revid as we want to target SOC stepping(Radhakrishna)

Cc: Matthew Auld <[email protected]>
Cc: Andi Shyti <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: Radhakrishna Sripada <[email protected]>
Signed-off-by: Nirmoy Das <[email protected]>
Reviewed-by: Andi Shyti <[email protected]>
Reviewed-by: Radhakrishna Sripada <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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