sensor_shell: fix missing channel and attribute names

The three sensor channels listed below were recently added by the commit
9471df95:
 - SENSOR_CHAN_GAME_ROTATION_VECTOR
 - SENSOR_CHAN_GRAVITY_VECTOR
 - SENSOR_CHAN_GBIAS_XYZ

Theses channel names are missing and causes a system crash if the
SENSOR_LOG_LEVEL is set to DEBUG.

Also, the two sensor attributes SENSOR_ATTR_GAIN and SENSOR_ATTR_RESOLUTION
were added by the commit f849140d.

This adds these missing channel and attribute to the list of names in the
sensor shell.

Signed-off-by: Gaël PORTAY <gael.portay@rtone.fr>