Update AudioService to use manifest constants for @EnforcePermission

There are some usages of "short strings" for manifest permissions that
cause the latest version of the EnforcePermissionDetector lint to fail,
because it expects values that resolve to the fully qualified permision
name e.g. "android.permission.MODIFY_AUDIO_ROUTING".

"Short strings" like "MODIFY_AUDIO_ROUTING" are allowed in .aidl files,
and the AIDL compiler resolves them to the fully qualified values in
generated java.

The attached bug has been opened to decide if we should update the
lint to allow this syntax in the java annotation since it is supported
in .aidl.

Bug: 270686198
Test: TH
Change-Id: Ifd2e39b53f614c3aaf9d03413ac46fd0c6909162