Revert "Allow null TransmitPowerRange ctor argument for ModemActivityInfo"

This reverts commit c6dd53b3672fdbabb46f1dcc30a7d3a2acde8b0f.

Reason for revert: requested by API council.

Bug: 145979919
Bug: 143565652
Change-Id: I80739d5d904788e2bda8634919f8e993c4db6c8a
2 files changed