Reword bluetooth confirmation dialog

Changing the text near the checkbox allowing contacts/call history
access from "Allow $device_name to access your contacts and call
history" to just "Allow access to your contacts and call history" to
avoid problem where a properly crafted remote device name can make the
"to access your contacts and call history" text get pushed down below
the fold, and mislead users into thinking the checkbox has a different
meaning.

Bug: 62672248
Test: manual (initiate bluetooth pairing with another phone or a
computer, observe pairing dialog text)

Change-Id: I770852739f6791c2b9a36ab45c526bab3f3b9be1