Telephony: Introduce config item for Hot Swap support

When a Uicc Card is inserted or removed, Android pops up a prompt
to the user to reboot the device. This prompt is unnecessary if the
modem supports Hot Swapping of cards.

Introduce a new config item to indicate if the modem supports
hotswapping. Frameworks can then check this before propmting the
user.

Bug: 12161291
Change-Id: I0f2c3134525aa2301fd667d0a1819f4419eecae0
(cherry picked from commit 5cbf6098c0d4bb830acd6ef45e8a3c1cedfb165c)
(cherry picked from commit 067089c6a1a8acc638f563f817dafef9172083f0)
(cherry picked from commit fd5d8910922bb16095367d09077e5974422e57ce)