amdkfd: explicitely include io.h in kfd_doorbell.c

This patch fixes a compilation error when using certain configuration by
including the file io.h in kfd_doorbell.c

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>
Signed-off-by: Oded Gabbay <oded.gabbay@amd.com>
1 file changed