Add throttlingDataId to deviceConfig

Currently, we don't have the ability to specify the
brightnessThrottlingDataModeId when overriding values in
BrightnessThrottler through the DeviceConfig. If we do use the
DeviceConfig to override values, any mode-specific throttling policies
will be overwritten and lost, since we do not pick and choose between
the DeviceConfig values and the DisplayDeviceConfig values.

This change allows us to specify the brightness throttling id in the
DeviceConfig strings, in order to change the throttling policy based on
the id chosen based on the current display layout.

Strings passed used by the display config must specify the uniqueDisplayId,
and may specify the throttling id, if unspecified, "default" will be used.

Valid strings can include:
123,1,critical,0.8;456,2,moderate,0.9,critical,0.7
123,1,critical,0.8,default;123,1,moderate,0.6,mode_2;456,2,moderate,0.9,critical,0.7

Given that one BrightnessThrottler is currently created for each
DisplayPowerController, the values stored for the current mode are just
per display, but the String & derived data passed in via DeviceConfig will
continue to be global, since this is more effective for debugging
purposes.

DeviceConfig values take top priority, however, throttling Id specific
values take priority over default values, so an
Id-specific value set from the DisplayDeviceConfig, will take priority
over a default throttling id value from DeviceConfig.

Bug: 267623520
Test: atest com.server.android.display
Test: atest BrightnessThrottlerTest DisplayModeDirectorTest LogicalDisplayMapperTest
Test: adb shell cmd device_state state 4 && adb shell device_config put display_manager brightness_throttling_data "local:4619827677550801152,3,moderate,0.5,severe,0.379518072,emergency,0.248995984\;local:4619827677550801153,1,moderate,0.75\;local:4619827677550801153,1,moderate,0.11,concurrent"

Change-Id: I90bd673c794bdcf4b6522997bacd924d7e122c09