cmhw: Use hardware's default value for color enhancement

 * First boot should use the value read from sysfs rather than
   forcing the feature to be enabled.

Change-Id: Ibed5d8f3dc3644f972caf07853ca921c963dacfa
(cherry picked from commit f3a4a58bf24fc7aad9729bd6b16d6baa1caa7770)
Settings: Create SAR level preference, allow overlay.

Change-Id: I1af616696702f72b8a6276b3b01e940d61735137
(cherry picked from commit e52c731453779032fb3f1cf17c32da74a33fb302)