[EFR32] Update the pointer to efr32_sdk repo (#19056)

* Test added march 8 (#15957)

* Added new manual scripts

* Added Auto generated File

* [OTA] Fix OTARequestorDriverImpl inclusion (#15981)

* Regen to fix CI failures (#15990)

* [ota] Store Default OTA Providers in flash (#15970)

* [ota] Store Default OTA Providers in flash

Store Default OTA Providers in flash each time the attribute
is modified and load it back on the application startup.

* Restyled by clang-format

* Fix build and reduce flash usage

Co-authored-by: Restyled.io <[email protected]>

* Update the pointer to third_party/efr32_sdk/ repo, add missing BRD4187A headers.

* Remove merge artifacts

Co-authored-by: kowsisoundhar12 <[email protected]>
Co-authored-by: Carol Yang <[email protected]>
Co-authored-by: Boris Zbarsky <[email protected]>
Co-authored-by: Damian Królik <[email protected]>
Co-authored-by: Restyled.io <[email protected]>