configstore: Add display configuration items

This adds to configstore@1.0 HAL two new configuration
items that indicate if the display support WideColor
or HDR.
Configuration is controlled by TARGET_HAS_WIDE_COLOR_DISPLAY
and TARGET_HAS_HDR_DISPLAY in the board config file.

Test: make tests in libs/gui/tests/
Test: adb sync
Test: adb shell /data/nativetest/libgui_test/libgui_test

Change-Id: I442febc602851577c470c038a7fbf056c8ed25a7