Add DeviceConfig flag for enforcing receiver restrictions

Allows the restrictions on the SDK sandbox registering broadcast
receivers to be enabled or disabled depending on the value of a
DeviceConfig property in the Sdk Sandbox namespace.

Test: atest SdkSandboxRestrictionsHostTest
Bug: 229199225
Change-Id: Id6194b2b90bdf8eaa3b0e59cf8dff0b735d663bb