drivers: soc: ti: knav_qmss_queue: Make knav_gp_range_ops static

Fix the following sparse warning:

drivers/soc/ti/knav_qmss_queue.c:412:23: warning: symbol 'knav_gp_range_ops' was not declared.

The knav_acc_firmwares has only call site within knav_qmss_queue.c
It should be static

Fixes: 41f93af9 ("soc: ti: add Keystone Navigator QMSS driver")
Reported-by: Hulk Robot <hulkci@huawei.com>
Signed-off-by: Samuel Zou <zou_wei@huawei.com>
Signed-off-by: Santosh Shilimkar <santosh.shilimkar@oracle.com>