PM / AVS: SmartReflex: introduce SmartReflex Algorithms module

Now SmartReflex is designed to work without such abstraction
as "SmartReflex class". It is designed to choose appropriate
calibration algorithm, according to it settings retrieved from
device tree. Algorithms module is a container of calibration
logic. All algorithms are "private". The only API which is
exported is:

Init algorithms on boot:
- int sr_init_algs(struct omap_sr *sr);
- int sr_deinit_algs(struct omap_sr *sr);

"Getters" for calibration algorithms. Used for appropriate initialization
of driver callbacks, according to DTB parameters (calibration type,
voltage type and loop type).

sr_start_calibration_pfunc
sr_get_start_calibration_func(enum omap_sr_calibration_period period);

sr_stop_calibration_pfunc
sr_get_stop_calibration_func(enum omap_sr_calibration_period period);

sr_start_loop_pfunc
sr_get_start_loop_func(enum omap_sr_calibration_loop loop);

sr_stop_loop_pfunc
sr_get_stop_loop_func(enum omap_sr_calibration_loop loop);

Right now the following instances are implemented:
- Continuous claibration. Was used in class 3
- Periodic calibration. Was used in class 1.5
- HW calibration loop. Was used in class 3 and 1.5

Other algorithms are not covered by this patch.
Their implementation is pending. It will be introduced asap.

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
PM / AVS: SmartReflex: start using Algorithms module

SmartReflex Algorithms is already introduced. Now it is
started to be used. Patch adds it appropriate initialization
and needed calls for calibration start/stop.

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
PM / AVS: SmartReflex: sr_class is removed as useless

Since SmartReflex Algorithm module is started being used,
SmartReflex class is not needed any more. Now it usage is
removed from driver.

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
ARM: dts: OMAP4430: add device node for AVS

Patch adds AVS device node definition for MPU voltagedomain.
Current DTB entry contains data to make SmartReflex working
as class 3.0 - continuous calibration, HW loop.

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
TEST ONLY: PM / AVS: force calibration on boot on OPP_NOM

Patch is added to verify first time calibration,
which occurs immediately after SmartReflex driver probe.

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>
ARM: dts: OMAP4430: modify smartreflex_mpu device node for class 1.5

Patch adds needed data to make Smartreflex driver working as
class 1.5 - periodic calibration, HW loop

Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>