wcnss: Add wcnss support for 8974

- Install 5wire interface for wcnss device.
- Add the powerup sequence for wcnss device.
- Apply regulator settings by dynamically detecting the hardware.
- Add device tree documentation for WCNSS platform driver.

Change-Id: I533b56001313a480231f1e30d16ce12730f15f37
Acked-by: Bharath Pandravada <bharathp@qca.qualcomm.com>
Signed-off-by: Sameer Thalappil <sameert@codeaurora.org>
9 files changed