Add support for Vizio sound mode (#33200)

* add sound mode support for devices that support it

* make setting and unsetting flag better

* move eq and audio settings into constants

* fix missed statement to use constant instead of hardcoded string

* further fixes based on review

* bump pyvizio version to include newly identified app

homeassistant/components/vizio/const.py

@@ -63,6 +63,9 @@ SUPPORTED_COMMANDS = {
     ),
 }
 
+VIZIO_SOUND_MODE = "eq"
+VIZIO_AUDIO_SETTINGS = "audio"
+
 # Since Vizio component relies on device class, this dict will ensure that changes to
 # the values of DEVICE_CLASS_SPEAKER or DEVICE_CLASS_TV don't require changes to pyvizio.
 VIZIO_DEVICE_CLASSES = {