Allow use of hifi_fft for hifi5 target arch. (#1145)

Co-authored-by: NTing Yan <94130036+tingyan19@users.noreply.github.com>
Co-authored-by: Nmergify[bot] <37929162+mergify[bot]@users.noreply.github.com>

tensorflow/lite/micro/tools/make/ext_libs/xtensa.inc

@@ -130,7 +130,7 @@ FFT_PATH := $(MAKEFILE_DIR)/downloads/hifi_fft
 
 INCLUDES += -I$(FFT_PATH)/
 
-ifeq ($(TARGET_ARCH), $(filter $(TARGET_ARCH), hifi3 hifi4 hifi4_internal))
+ifeq ($(TARGET_ARCH), $(filter $(TARGET_ARCH), hifi3 hifi4 hifi4_internal hifi5))
 THIRD_PARTY_KERNEL_CC_SRCS += \
     $(shell find $(FFT_PATH)/hifi3_fft -name "*.c")