accel/qaic: Include signal.h in qaic_control.c

accel/qaic: Include signal.h in qaic_control.c

Include linux/sched/signal.h in qaic_control.c
to avoid implicit inclusion of signal_pending().

Signed-off-by: Zack McKevitt <zmckevit@qti.qualcomm.com>
Signed-off-by: Youssef Samir <youssef.abdulrahman@oss.qualcomm.com>
Reviewed-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Reviewed-by: Carl Vanderlip <carl.vanderlip@oss.qualcomm.com>
Signed-off-by: Jeff Hugo <jeff.hugo@oss.qualcomm.com>
Link: https://lore.kernel.org/r/20251007154525.415039-1-youssef.abdulrahman@oss.qualcomm.com