I also reproduced your problem in my build environment, I have reported this issue to the Application team.
So far, please use LOG_LEVEL="40" in atf Makefile, please refer to the following modification in Makefile.
# Process Debug flag
$(eval $(call add_define,DEBUG))
DEBUG := 1
ifneq (${DEBUG}, 0)
BUILD_TYPE := release
TF_CFLAGS += -g
ASFLAGS += -g -Wa,--gdwarf-2
# Use LOG_LEVEL_INFO by default for debug builds
LOG_LEVEL := 40
else
BUILD_TYPE := release
$(eval $(call add_define,NDEBUG))
# Use LOG_LEVEL_NOTICE by default for release builds
LOG_LEVEL := 20
endif