Settings: Show Baseband version on MSIM devices

Change-Id: Ie527e224e2c2197ff5d46abbcf8401439df12472
Fix FC when trying to adjust radio band via *#*#4636#*#* dialer code.

Fixes:

1. Add additional strings to BAND_NAMES array for additional bands from ril.h
2. Fix logic when adding band strings to selection list (for loop ends before entire array is read)

Change-Id: I5ff883a469f757a30c71d7d72c8f6ace19ce7a4d
Signed-off-by: Andrew Xie <andrew.w.xie@gmail.com>
(cherry picked from commit 4845045bb2dfd9b1a67f9f0c62bb44bfc5152284)
Settings: Conditionally remove Buttons tile from Dashboard

Change-Id: Iaddd3dd87ea2b0b04e3f312a156a6a25a948d039
Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>
Settings: Catch NPE caused by attempting to invoke virtual method  on a null object reference

Change-Id: I86ae0f7b46b12533190228404e0bed406d85b2e6
Signed-off-by: Brandon McAnsh <brandon.mcansh@gmail.com>
Add back a helper pref that holds a system setting.

Change-Id: I7d8978829bde1f1dd15bf59f464557f64aa07beb