ARM: dts: qcom: Add device nodes for second AFE rx and proxy tx devices

* Add afe_proxy_tx_2 node for proxy capture frontend device.
* Add afe_pcm_rx_2 node for afe playback backend device.
* Add the new nodes to the ADP soundcard.

Change-Id: Ibd8f0fa611b33e23be8a440bee7f880fdb2bf520
Signed-off-by: Alexy Joseph <alexyj@codeaurora.org>
Signed-off-by: Han Lu <hanlu@codeaurora.org>