ARM: dts: msm: Add slimbus instance entries for SDM670

Add Audio and QCA slimbus instance entries.
Entries are disabled by default. Need to enable
along with slave instances.

Signed-off-by: Shrey Vijay <shreyv@codeaurora.org>
Change-Id: I24220e9af890c41725b074a3aa4dea38de18794e