bsd-user/host/arm/host-signal.h: Implement host_signal_*

Implement host_signal_pc, host_signal_set_pc and host_signal_write for
arm.

Signed-off-by: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Wa

bsd-user/host/arm/host-signal.h: Implement host_signal_*

Implement host_signal_pc, host_signal_set_pc and host_signal_write for
arm.

Signed-off-by: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

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