fix(android): remove READ_PHONE_STATE permission

[adriano-di-giovanni]

Platforms affected

• Android

Motivation and Context

The plugin uses the OnAudioFocusChangeListener to listen to audio focus changes such as the ones that happen on incoming calls. There is no need to request the android.permission.READ_PHONE_STATE because it is not needed.
I think it's good to remove such permission because it has a dangerous protection level.

Description

Removed <uses-permission android:name="android.permission.READ_PHONE_STATE" /> frrom plugin.xml

[erisu]

The changes looks good and the description about Protection level: dangerous is accurate. This permission should be drop.

[breautek]

Android docs states:

Allows read only access to phone state, including the current cellular network information, the status of any ongoing calls, and a list of any PhoneAccounts registered on the device.

READ_PHONE_STATE was added/released in version 0.2.7 with no attached issue or jira ticket neither in the release notes or in the commit

Furthermore, even though the permission was declared, I don't see anywheres where it actually requests the permission. Not sure what was the intent of it being added but I agree it should be removed.