soc: ti: knav_qmss_queue: change knav_range_setup_acc_irq to static

knav_range_setup_acc_irq() is used only within the file and should
be defined as static.

Signed-off-by: Murali Karicheri <m-karicheri2@ti.com>
Signed-off-by: Santosh Shilimkar <ssantosh@kernel.org>