[AM335X][VOLTDM] Create voltdm support for AM335X

Create voltage domain functions and definitions for the AM335X to
support the show opp command. Update the common voltage domain files
to support the AM335X voltdm functions.

Signed-off-by: Gilberto Rodriguez <gilrod@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
[PMIC] Support AM335X voltage domain to TPS65217X SMPS mapping

PMIC is now able to convert AM335X voltage domains to PMIC SMPS IDs
and vice versa.

NOTE: This mapping is as per BeagleBone Black platform, which happens to
be one of the most prevelant AM335X public platform.

Signed-off-by: Gilberto Rodriguez <gilrod@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
[AM335X][MODULES] Add AM335X modules for show opp

Add a few AM335X modules to support the show opp command, i.e., l3 and
l4 interconnects, emif, and mpu modules. Defined most of the mods that
could be implemented in the future. Update the common module files to
support the AM335X module functions.

Include the neccessary defines in the common opp header to build.

Signed-off-by: Gilberto Rodriguez <gilrod@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
[AM335X][OPP] Support for AM335X opp support functions

Add functions for AM335X opp to support omapconf show opp command.
Support for AM335X ES1 and ES2_X opps (minor opp and frequency
differences).

Signed-off-by: Gilberto Rodriguez <gilrod@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
[AM335X][OPP] Add support for show opp command

Update the common opp files to support the AM335X opp functions.
Update to AM335X main to call the omapconf show opp command. Update
help to print the show opp command.

Signed-off-by: Gilberto Rodriguez <gilrod@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>