accel: Rename accel-common.c -> accel-target.c

We use the '-common.c' suffix for target agnostic units.
This file is target specific, rename it using the '-target'
suffix.

Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
Reviewed-by: Anton Johansson <anjo@rev.ng>
Message-Id: <20230914185718.76241-6-philmd@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

accel/meson.build

-specific_ss.add(files('accel-common.c'))
+specific_ss.add(files('accel-target.c'))
 system_ss.add(files('accel-softmmu.c', 'accel-blocker.c'))
 user_ss.add(files('accel-user.c'))