Move InCallActivityCommon#dismissKeyGuard to InCallActivity.

This is part of the effort to delete InCallActivityCommon. There are 25 references to InCallActivityCommon in InCallActivity and we will remove them one at a time.

Bug: 69272096
Test: None
PiperOrigin-RevId: 175718978
Change-Id: I0713bd28c2d34791045be2bb851003000b88abca
2 files changed