clk: qcom: Add support for root clock generator with ramp controller

The RCGwRC consists of 2 major modules
- Root clock Generator
	- This is a legacy root clock generator module.
- Ramp Controller
	- Swallows clock pulses based on LMHlite requirement.
	- Perform clock ramp up/down operation during dfs operation.
	- Hand shake with lmhlite hardware for new configuration.
This ramp controller driver allows programming the sequence ID for pulse
swallowing, enable sequence and for linking sequence IDs.

Change-Id: I92ead5f5aa8dee292f5ae3ce708c406c12910ecb
Signed-off-by: Taniya Das <tdas@codeaurora.org>