nimble/controller: Reduce padding in ble_ll_adv_sm
nimble/controller: Reduce padding in ble_ll_adv_sm

Move some fields around to minimize padding.

X-Original-Commit: fca1b8a5c110f6a2c15d34e0d1730b36adc9ea3a

apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble,apache/mynewt-nimble