bsd-user: Add trace events for bsd-user

Add the bsd-user specific events and infrastructure. Only include the
linux-user trace events for linux-user, not bsd-user.

Signed-off-by: Stacey Son <sson@F

bsd-user: Add trace events for bsd-user

Add the bsd-user specific events and infrastructure. Only include the
linux-user trace events for linux-user, not bsd-user.

Signed-off-by: Stacey Son <sson@FreeBSD.org>
Signed-off-by: Kyle Evans <kevans@freebsd.org>
Signed-off-by: Warner Losh <imp@bsdimp.com>
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

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