Revert "Bluetooth: Set name_state to unknown when entry name is empty"

This reverts commit c9539f995d1e6655bd38bd80da093a0e2fc16160.
Revert "Bluetooth: Fix using a NULL inquiry cache entry"

This reverts commit 1202bebaed1b9049994f208ed073d883df3ce6b0.
Revert "Bluetooth: Fix using NULL inquiry entry"

This reverts commit 1ba19b1fd34ff0366d053603ac6b4a3ace0c998e.
Revert "Bluetooth: mgmt: Fix enabling LE while powered off"

This reverts commit efcde156663b7c8de217bfac4b49a9eedebb5854.
Revert "Bluetooth: mgmt: Fix enabling SSP while powered off"

This reverts commit 67c4fda9880ce05001fd0aa5cd83e5d91cab8b93.
Revert "Bluetooth: Fix not removing power_off delayed work"

This reverts commit 197789db90d24a09a1fba4a1432d75fa38497f11.
Revert "Bluetooth: Fix use-after-free bug in SMP"

This reverts commit 0d383f381bb4c0bec4ad2de0b0571ae5c58cd7bb.