Revert "2/ Add mechanism to expose other features directly"

Revert "Add shell aidl files"

Revert "Update starting window init call for CarLauncher"

Revert submission 13608835-shell_feature_interfaces

Reason for revert: SysUI Studio aidl import issue
Reverted Changes:
I49a5a0419:2/ Add mechanism to expose other features directly...
I19425896d:Update starting window init call for CarLauncher
If048d2cd9:1/ Add mechanism to expose shell feature directly ...
Ibb8365d3c:Add shell aidl files
Ie41b0b77a:Update calls to go through the feature interface i...

Change-Id: I8bacc844fc3f0447311b5a97c4d356f2fb80f3ce