arm64: fix hardware single-stepping from EL1

The main issue is that debug exceptions must to be disabled for the
entire duration that SS bit in MDSCR_EL1 is set. Otherwise, a
single-step exception will be generated immediately. This can occur
before returning from the debugger (when MDSCR is written to) or before
re-entering it after the single-step (when debug exceptions are unmasked
in the exception handler).

Solve this by delaying the unmask to C code for EL1, and avoid unmasking
at all while handling debug exceptions, thus avoiding any recursive
debug traps.

Reviewed by: markj, jhb
Sponsored by: The FreeBSD Foundation

(cherry picked from commit 874635e381731e1fbd5e2d0459ca87814f1e455c)