build: Fix inputs to generated test drivers (#3900)
build: Fix inputs to generated test drivers (#3900)

And remove redundant "generated" string from the name. The gen dir only
contains generated files.

Tested by:
  touch src/transport/raw/tests/TestTCP.cpp
  ninja -C out/host -d explain gen/TestTCP.driver.cpp
nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip