ARM: dts: msm: Add slimbus slave device for wcn3990 on sdm630

Slimbus is used as audio transport for Bluetooth & FM between sdm630 &
wcn3990. Add device tree entry for wcn3990 slimbus slave device in sdm630.

Change-Id: Ie5ee241e0a952b61e84682a289c69d10877cedd1
Signed-off-by: Rupesh Tatiya <rtatiya@codeaurora.org>