Add KEY_ONLY_SINGLE_DC_ALLOWED_INT_ARRAY

Add the key to CarrierConfigManager and remove the old configs which are
no longer needed.

Bug: 29873049
Change-Id: I2197cabca2addbbbe15f0f13985a6f5d8794d64a
Merged-In: I2197cabca2addbbbe15f0f13985a6f5d8794d64a
7 files changed