boards: cc3220sf: add bosterpack_connector.dtsi

This can be used in DTOs

The boosterpack_connector.dtsi is an attempt to add something similar
to the arduino_r3_connectors that make using DT overlays with these
boards far easier and cleaner.
This can probably also be expanded to other CC32x TI launchpads
having similar layouts.

Referred swru465, ie. cc3220 TRM Table 5-14 and compared with launchpad
pinout. The numbering is done from 0...40 as per in the boosterpack pinout.
The pins like VCC/ GND have been skipped from the numbering. Also
the non-default pins are skipped.

Also add gpio status ok: This ensures that all the gpios are
enabled by default

Signed-off-by: Dhruva Gole <goledhruva@gmail.com>