Store MEDIA_CONTENT_CONTROL permission access in RouterRecord

This is a non-functional refactor in preparation for enabling screen off
scanning to routers (proxy or local) holding MEDIA_CONTENT_CONTROL
permission.

Bug: 352401364
Flag: EXEMPT no meaningful functional changes
Test: atest CtsMediaBetterTogetherTestCases CtsMediaHostTestCases
Change-Id: I68d5c3b7e518388e6d8eef1f96fa3f2a3c9b7784