linux-user: move mips/mips64 signal.c parts to mips directory

linux-user: move mips/mips64 signal.c parts to mips directory

No code change, only move code from signal.c to
mips/signal.c, except adding includes and
exporting setup_frame() and setup_rt_frame().

mips64/signal.c includes mips/signal.c

Signed-off-by: Laurent Vivier <laurent@vivier.eu>
Reviewed-by: Philippe Mathieu-Daudé <f4bug@amsat.org>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20180424192635.6027-19-laurent@vivier.eu>