libminradio: support deferred rilConnected

Bug: 405183501
Test: boot cf_phone with ngril but without modem connected
Flag: EXEMPT vendor HAL changes only
(cherry picked from https://googleplex-android-review.googlesource.com/q/commit:91258e107a01092ed732988dbd7f63fb516f72d3)
Merged-In: I8c4c25748b77666cf93a1895d968f9cd66fe38b2
Change-Id: I8c4c25748b77666cf93a1895d968f9cd66fe38b2
12 files changed