i965/gen9: Allocate YF/YS tiled buffer objects

i965/gen9: Allocate YF/YS tiled buffer objects

In case of I915_TILING_{X,Y} we need to pass tiling format to libdrm
using drm_intel_bo_alloc_tiled(). But, In case of YF/YS tiled buffers
libdrm need not know about the tiling format because these buffers
don't have hardware support to be tiled or detiled through a fenced
region. libdrm still need to know buffer alignment value for its use
in kernel when resolving the relocation.

Using drm_intel_bo_alloc_for_render() for YF/YS tiled buffers
satisfy both the above conditions.

V2: Delete min/max buffer size restrictions not valid for i965+.
    Remove redundant align to tile size statements.
    Remove some redundant code now when there are no min/max buffer size.

Signed-off-by: Anuj Phogat <anuj.phogat@gmail.com>
Reviewed-by: Ben Widawsky <ben@bwidawsk.net>