Lisk-mobile: Stop using Android ID ( the getUniqueId method ) as username for keychain storage

[ManuGowda]

Expected behavior

Using the Android ID may raise concerns about users' privacy and it forces the READ_PHONE_STATE permission to be used, which may be alarming for users. Use an application-wild constant instead, possibly concatenated with a random string.

Reference: https://github.com/LiskHQ/lisk-mobile/blob/52ac8a151ee4f4fe6f3dbd3f50343ca2052731c9/src/modules/Auth/utils/recoveryPhrase.js#L105-L105