Add EULA management includes

Add contents conf/EULA.conf to conf/local.conf if this file exists
This is required for STM32MP where the EULA variable contains the machine
and must not be set when no graphics is available.
E.g. ACCEPT_EULA_stm32mp-t100x-testadapter = "1"

ci/yocto-ktn-common.yml

@@ -39,6 +39,7 @@ stages:
 
 .build-script: &build-script
   - echo "ACCEPT_FSL_EULA = \"1\"" >> conf/local.conf
+  - test -e conf/EULA.conf && echo "include EULA.conf" >> conf/local.conf
   - bitbake $BUILD_TARGETS
 
 .init-meta: