drm/i915/region: fix max size calculation

We are incorrectly limiting the max allocation size as per the mm
max_order, which is effectively the largest power-of-two that we can fit
in the region size. However, it's normal to setup the region or
allocator with a non-power-of-two size(for example 3G), which we should
already handle correctly, except it seems for the early too-big-check.

v2: make sure we also exercise the I915_BO_ALLOC_CONTIGUOUS path, which
is quite different, since for that we are actually limited by the
largest power-of-two that we can fit within the region size. (Chris)

Fixes: b908be543e44 ("drm/i915: support creating LMEM objects")
Signed-off-by: Matthew Auld <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: CQ Tang <[email protected]>
Reviewed-by: Chris Wilson <[email protected]>
Signed-off-by: Chris Wilson <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]
(cherry picked from commit 83ebef47f8ebe320d5c5673db82f9903a4f40a69)
Signed-off-by: Rodrigo Vivi <[email protected]>

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