Hexagon (target/hexagon) Add overrides for S2_asr_r_r_sat/S2_asl_r_r_sat

Hexagon (target/hexagon) Add overrides for S2_asr_r_r_sat/S2_asl_r_r_sat

These instructions will not be generated by idef-parser, so we override
them manually.

Test cases added to tests/tcg/hexagon/usr.c

Co-authored-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Signed-off-by: Matheus Tavares Bernardino <quic_mathbern@quicinc.com>
Signed-off-by: Taylor Simpson <tsimpson@quicinc.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20221108162906.3166-4-tsimpson@quicinc.com>