radeonsi: Use 'SI' as the LLVM processor for CIK on LLVM <= 3.3
radeonsi: Use 'SI' as the LLVM processor for CIK on LLVM <= 3.3

LLVM 3.3 does not know about CIK processors, and the codes paths for SI
and CIK are the same.

Reviewed-by: Marek Olšák <8c7344a1abdb103e79ecfd488098373070c3c70e@amd.com>
Cc: "9.2" <59f39c0db42d4479a46b02d4d2bc11120e37bb44@lists.freedesktop.org>

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