[efr32] add missing instance header include (#3224)
[efr32] add missing instance header include (#3224)


bukepo/openthread,erja-gp/openthread,librasungirl/openthread,abtink/openthread,erja-gp/openthread,turon/openthread,openthread/openthread,jwhui/openthread,srickardti/openthread,openthread/openthread,turon/openthread,chshu/openthread,erja-gp/openthread,erja-gp/openthread,abtink/openthread,srickardti/openthread,openthread/openthread,chshu/openthread,bukepo/openthread,jwhui/openthread,erja-gp/openthread,chshu/openthread,srickardti/openthread,lanyuwen/openthread,lanyuwen/openthread,chshu/openthread,turon/openthread,turon/openthread,jwhui/openthread,chshu/openthread,lanyuwen/openthread,abtink/openthread,srickardti/openthread,librasungirl/openthread,erja-gp/openthread,openthread/openthread,bukepo/openthread,librasungirl/openthread,bukepo/openthread,lanyuwen/openthread,librasungirl/openthread,abtink/openthread,chshu/openthread,lanyuwen/openthread,lanyuwen/openthread,jwhui/openthread