g2: Telephony services for Sprint ls980 - perferred apns

Configure certain GsmUmtsOptions to be available or not. The default values are in Phone/res/values/config.xml and maybe overridden in operator specific resource directories or device specific overlays

*before - https://i.imgur.com/blwSKk2.png
*after - https://i.imgur.com/loxgdne.png

*fixes issues with ls980 not being able to send sms, mms while on LTE due to not being on the correct apn. This allows to choose the correct preferred network to be able to

Signed-off-by: houst0nn <houstonn@gmail.com>
ls980: The mms content disposition field is supported correctly. if it is true...If false, some fields of content disposition do not follow wap-230-wsp-20010705-a.rdf

Signed-off-by: houst0nn <houstonn@gmail.com>
g2: VoLTE: If Voice Radio Technology is RIL_RADIO_TECHNOLOGY_LTE:14 this is the value that should be used instead. A value of RIL_RADIO_TECHNOLOGY_UNKNOWN:0 means there is no replacement value and VoLTE is assumed to be supported. For sprint we will use RIL_RADIO_TECHNOLOGY_1xRTT:6 -->

Signed-off-by: houst0nn <houstonn@gmail.com>
g2: Enabled lte option for Sprint

Signed-off-by: houst0nn <houstonn@gmail.com>