Improve effect proxy dumpsys

- remove the dump() call to the effect HAL in proxy, keep UUID
- improve the indent so it fits with audio_flinger
- replace decimal with hex string for uuid logging
- keep common capability in the proxy dump

Flag: EXEMPT bugfix
Bug: 419865604
Bug: 397236443
Test: dumpsys media.audio_flinger
Change-Id: Iedd17f8925c15e23edf675f3c935226c16c55512