Telephony(MSIM): Enable telephony-ext jar in build

Include telephony-ext jar library in PRODUCT_PACKAGES
and PRODUCT_BOOT_JARS.
telephony-ext jar is needed for MSIM manual provisioning
and for other telephony related functionalities to work.

Change-Id: I71a0735bf75e66c57a393d4b06eb31a5e0e8a979
Signed-off-by: Apavayan Sinha <info@apavayan.com>