OMAP: Introduce accessory APIs for DVFS

This patch introduces accessory APIs for DVFS.
Data structures added:
1. omap_dev_user_list: This structure maintains list of frequency requests per
   device basis. When a device needs to be scaled to a particular frequency,
   This list is searched to find the maximum request for a given device.
   If noone has placed any request, device frequency is obtained from device
   opp table.
2. omap_vdd_dev_list: This strcucture stores device list per vdd basis.
   Whenever a device is registered with a vdd, it is added to this list.
3. omap_vdd_user_list: User list of devices associated with each voltage domain
   instance. The user list is implemented using plist structure with priority
   node populated with the voltage values.
4. omap_vdd_dvfs_info: This structure is used to abstract DVFS related
   information per VDD basis. It holds pointer to corresponding vdd's
   voltagedomain instance and pointer to user list.

Following APIs have been added to operate on above data structures:
1. omap_dvfs_add_vdd_user - API to add a user into omap_vdd_user_list
2. omap_vdd_user_list - API to remove a user from omap_vdd_user_list
3. omap_dvfs_register_device - API to register a device with vdd
4. omap_dvfs_add_freq_request - API to add a frequency request into
   omap_dev_user_list
5. omap_dvfs_remove_freq_request - API to remove a frequency request from
   omap_dev_user_list
6. omap_dvfs_find_voltage - API to find the opp corresponding to given voltage

DVFS layer is initialized and basic data structures are allocated and
initialized as part of this.

This patch is based on Thara's previous DVFS implementation, but with major
rework.

Signed-off-by: Vishwanath BS <vishwanath.bs@ti.com>
Cc: Thara Gopinath <thara@ti.com>

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