regs: Use new compatible interface

Enhance the phosphor-regulators application to use the new D-Bus
interface xyz.openbmc_project.Inventory.Decorator.Compatible.

The list of compatible system type

regs: Use new compatible interface

Enhance the phosphor-regulators application to use the new D-Bus
interface xyz.openbmc_project.Inventory.Decorator.Compatible.

The list of compatible system type names from this interface is used to
find the configuration file for the current system.

Rename the configuration files to match the system type names in the new
D-Bus interface.

Tested:
* Verified phosphor-regulators loaded correct config file
* When interface was available before app started
* When interface was available after app started
* When interface was available after configure action started
* When interface was never available but default config file exists
* On Rainier, Everest, and Fuji systems
* Verified system could be powered on and off without error
* Verified app waited up to 5 minutes during configure action for
interface to become available. Verified critical error logged and
power on failed if interface not found within 5 minutes.

Change-Id: Icee0c59566c68730ca318fc4521f05af2546eed1
Signed-off-by: Shawn McCarney <shawnmm@us.ibm.com>

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