i965: Push intel_get_texture_alignment_unit call into brw_miptree_layout

intel_miptree_create_layout() calls intel_get_texture_alignment_unit()
and then immediately calls brw_miptree_layout().  There are no other
callers.

intel_get_texture_alignment_unit() populates the miptree's alignment
unit fields, which are used by brw_miptree_layout() to determine where
to place each miplevel.  Since brw_miptree_layout() needs those to be
present, it makes sense to have it initialize them as the first step.

Signed-off-by: Kenneth Graunke <[email protected]>
Reviewed-by: Chad Versace <[email protected]>

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