Remove hal_drm from mediadrmserver domain

HAL clients should not be annotated with hal_x and haldomain. This may
grant them too much access. Instead, the policy needed for using
in-process HALs should be directly embedded into the client's domain
rules.

This reverts the moving of rules out of mediadrmserver in commit
c86f42b9.

Test: YouTube videos play back, no mediadrmserver denials
Bug: 34715716
Bug: 32815560
Change-Id: Ib57ef880bcc306c6e01f2c24c0f3a4298598eb9a