The Zb[abcs] support code still uses the RISCV_CPU macros to access
the configuration information (i.e., check whether an extension is
available/enabled).  Now that we provide this information directly
from DisasContext, we can access this directly via the cfg_ptr field.

Signed-off-by: Philipp Tomsich <philipp.tomsich@vrull.eu>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Suggested-by: Richard Henderson <richard.henderson@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20220202005249.3566542-5-philipp.tomsich@vrull.eu>
Signed-off-by: Alistair Francis <alistair.francis@wdc.com>