audio: Add AUDIO_CHANNEL_OUT_13POINT_360RA constant

13ch audio constant for 360 Reality Audio.

The enum value is added in system/media/audio/audio-hal-enums.h.
 - Define the same enum to HALv7.
 - Set 13 for the layout from getChannelCount().

Bug: 185100731
Test: Use the value on audio hal and build.
Test: Use the value on audio_policy_configuration.xml and build.
Test: atest android.hardware.audio.common@7.0-util_tests
Change-Id: Ifa37f9be96a94c623e5d4164774c39d05efbbb8b