Let's just add timeout parameter to os_eventq_get instead and have
single API to get event from queue. The handing of timeout can be
optimied by compiler if static inline is used to implement this.
Currently nimble_npl_os.h is included before APIs are declared. This is
to make sure all OS-specific types are defined early since they are
needed for APIs declaration. This has a nice side effect since we can
simply define some simple APIs as static inlines in nimble_npl_os.h and
later declarations will simply inherit linkage of prior symbol, thus no
error is emitted. As a result, we do not need BLE_NPL_STORAGE_DECL thus
let's just remove it.
Andrzej Kaczmarek