riscv: Convert interrupt logs to use qemu_log_mask()

riscv: Convert interrupt logs to use qemu_log_mask()

Currently we log interrupts and exceptions using the trace backend in
riscv_cpu_do_interrupt(). We also log exceptions using the interrupt log
mask (-d int) in riscv_raise_exception().

This patch converts riscv_cpu_do_interrupt() to log both interrupts and
exceptions with the interrupt log mask, so that both are printed when a
user runs QEMU with -d int.

Signed-off-by: Alistair Francis <[email protected]>
Reviewed-by: Philippe Mathieu-Daudé <[email protected]>
Message-id: 29a8c766c7c4748d0f2711c3a0abb81208138c5e.1601652179[email protected]