Add an additional layer of inheritance for `aosp_whitefin`,
`aosp_whitefin_64`, `aosp_whitefin_pkvm`, and `aosp_whitefin_hwasan`.
This change adds a common layer of inheritance for non-factory
products (whitefin_generic.mk). This makes it easier to configure
factory and non-factory products differently.
Non-factory `whitefin` products now inherits from
`device/google/raviole/whitefin_generic.mk` which inherit from
`device/google/raviole/device-whitefin.mk`.
aconfig flags: Flag: EXEMPT mechanical refactoring
build flags: Flag: EXEMPT mechanical refactoring
Bug: 338332183
Bug: 338332464
Test: lunch aosp_whitefin-trunk_staging-userdebug && m
lunch aosp_whitefin_64-trunk_staging-userdebug && m
lunch aosp_whitefin_pkvm-trunk_staging-userdebug && m
lunch aosp_whitefin_hwasan-trunk_staging-userdebug && m
Change-Id: I151d3e59141e566fad54f62ac01ab4372522fd5f