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Currently ${FIP_DEPS} as prerequisite for ${BUILD_PLAT}/${FIP_NAME}
contains .PHONY targets check_$(1) and therefore ${BUILD_PLAT}/${FIP_NAME}
is always rebuilt even when other file target prerequisites are not
changed.

These changes fix above issue and ${BUILD_PLAT}/${FIP_NAME} target is
rebuilt only when its prerequisites are changed.

There are 3 changes:

Content of check_$(1) target is moved into check_$(1)_cmd variable so it
can be easily reused.

.PHONY check_$(1) targets are not put into ${FIP_DEPS} and ${FWU_FIP_DEPS}
dependencies anymore and required checks which are in ${CHECK_FIP_CMD} and
${CHECK_FWU_FIP_CMD} variables are executed as part of targets
${BUILD_PLAT}/${FIP_NAME} and ${BUILD_PLAT}/${FWU_FIP_NAME} itself.

To ensure that ${BUILD_PLAT}/${FIP_NAME} and ${BUILD_PLAT}/${FWU_FIP_NAME}
are rebuilt even when additional dependency file image added by
TOOL_ADD_IMG is changed, this file image (if exists) is added as file
dependency to...