sme2: Enable SME2 support in gdbserver

This patch teaches gdbserver about the SME2 and the ZT0 register.

Since most of the code used by gdbserver for SME2 is shared with gdb, this
is a rather small patch that reuses most of the code put in place for native
AArch64 Linux.

Validated under Fast Models.

Reviewed-by: Thiago Jung Bauermann <thiago.bauermann@linaro.org>
1 file changed