semihosting/meson: Build config.o and console.o once

semihosting/meson: Build config.o and console.o once

config.c and console.c don't use any target specific
headers anymore, move them from specific_ss[] to
system_ss[] so they are built once, but will also be
linked once, removing global symbol clash in a single
QEMU binary.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Richard Henderson <richard.henderson@linaro.org>
Message-Id: <20250103171037.11265-6-philmd@linaro.org>
Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
Message-Id: <20250116160306.1709518-8-alex.bennee@linaro.org>