hwc2: Implement IDisplayConfig HIDL service.

- Add IDisplayConfig service in composer process.
- Add DisplayConfig wrapper to abstract
  IDisplayConfig interfaces.

CRs-Fixed: 2036340
Change-Id: I54535e7224ee842b761509268ebaa2e8425bc8d7
diff --git a/common.mk b/common.mk
index 88d1aee..b253c80 100644
--- a/common.mk
+++ b/common.mk
@@ -3,7 +3,7 @@
 
 #Common C flags
 common_flags := -DDEBUG_CALC_FPS -Wno-missing-field-initializers
-common_flags += -Wconversion -Wall -Werror -std=c++11
+common_flags += -Wconversion -Wall -Werror -std=c++14
 ifeq ($(TARGET_IS_HEADLESS), true)
     common_flags += -DTARGET_HEADLESS
     LOCAL_CLANG := false