Revert "InCallUI: Disable Back button on Non-intursive InCall Card"

This reverts commit 406942b25228a2e9d5b230dfb3f7723bf37c895c.
Revert "InCallUI: fix non intrusive incallui layout"

This reverts commit 13f99e566931fc105cd33a6d8450f01c73dc7179.
Revert "[3/3] InCallUI: allow disabling non intrusive incall ui"

This reverts commit 589028112d7c135fa1816ee479581e425d0cb5d3.
Revert "[1/2] InCall: Add a non-intrusive dialog for incoming calls"

This reverts commit 5b5b1888a5ad226df77253259481d2910da41a15.