Semaphore maximum count is hardcoded to 128

[afesheir]

In the API: ble_npl_sem_init, there is no way to define the maximum count for the semaphore being created, and this is left to the OS-specific implementation, like the API: npl_freertos_sem_init that defines this max value to 128.

Proposed solution: Add additional argument to the API: ble_npl_sem_init to define the maximum semaphore count, and this max value is to be passed to the OS-specific implementation.

[andrzej-kaczmarek]

we only use binary semaphores in NimBLE so it probably makes sense to just assume ble_npl_sem_init creates binary semaphore. if we need standard semaphore in future, we'll add dedicated API to initialize it.