[efr32] fix PAL scheduled-rx parameter (#350)
[efr32] fix PAL scheduled-rx parameter (#350)

For scheduled-rx config, set rxTransitionEndSchedule=1 to idle after
scheduled-rx operation. [Required after GSDK 4.1.0 update for EFR32].
openthread/ot-efr32,openthread/ot-efr32,openthread/ot-efr32