Enable binder caches in Bluetooth module

Bug: 214455273
Tag: #refactor

Re-enabled binder caches in the Bluetooth mainline module.

Manual testing was done by pairing a phone with a headset and
verifying that the caches were in use via 'dumpsys cacheinfo'.

Test: presubmit

Change-Id: I1948f22d2b0ca43152468cebf5395b786fd68ab0