Grant Shell CDM permissions

Granting Shell new permissions required for accessing
CompanionDeviceManager APIs (such as
REQUEST_COMPANION_PROFILE_APP_STREAMING,
REQUEST_COMPANION_SELF_MANAGED).
Permissions are needed for running CompanionDeviceManagerTest CTS test
(which utilizes adoptShellPermissionIdentity for accessing the API
protected by the said permissions).

Bug: 194301022
Test: atest CompanionDeviceManagerTest
Ignore-AOSP-First: new permissions (not yet in AOSP)
Change-Id: I2c8469661f3b6de4ee1e2aa37c919bc0ad25ef8f