SystemUI: Introduce VoLTE icon

@neobuddy89: Clean up unrequired derps. Adapted for A13 QPR2.

Co-authored-by: Adithya R <gh0strider.2k18.reborn@gmail.com>
Co-authored-by: Jyotiraditya Panda <jyotiraditya@aospa.co>
Co-authored-by: Pranav Vashi <neobuddy89@gmail.com>
Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

Improvements for dynamic VoLTE & VoWiFi icons

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

MobileSignalController: Try register IMS callback when listening

* Code taken from CAF with ProviderModel
* This should be addition to IMS state call back onAvailable().
* Remove ACTION_ENHANCE_4G_SWITCH, we do not have CAF stack to support this.

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

SystemUI: Update IMS states and update icon when necessary

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

* Fixes https://github.com/crdroidandroid/issue_tracker/issues/65



MobileSignalController: Remove unused volte leftover

Signed-off-by: Pranav Vashi <neobuddy89@gmail.com>

fix

remove vowifi option