runtime: fix potential curbe allocation issue.

runtime: fix potential curbe allocation issue.

According to spec, different platforms have different curbe
allocation restrication. The previous code set the curbe
allocated size to 480 statically which is not correct.

This patch change to always set the curbe entry num to 64
which is the maximum work group size. And set proper curbe
allocation size according to the platform's hard limitation
and a relatively reasonable kernel argument usage limitation.

v3:
when we call load_vte_state, we already know the eaxctly constant urb
size used in the current kernel. We could choose a smallest valid curbe
size for this kernel. And if the size exceed the hardware limitation,
we report it as a warning here.

Signed-off-by: Zhigang Gong <zhigang.gong@intel.com>
Reviewed-by: "Song, Ruiling" <ruiling.song@intel.com>