Fix build issues for variants of TARGET_ARCH=cortex-m7+fp

BUG=fixes https://github.com/tensorflow/tflite-micro/issues/1356

tensorflow/lite/micro/tools/make/targets/cortex_m_corstone_300_makefile.inc

@@ -176,7 +176,7 @@ CXXFLAGS += -D$(ARM_CPU)$(CMSIS_ARM_FEATURES)
 CCFLAGS += -D$(ARM_CPU)$(CMSIS_ARM_FEATURES)
 
 # For Ethos-U Core Driver. Header file name is depending on target architecture.
-CXXFLAGS += -DCMSIS_DEVICE_ARM_CORTEX_M_XX_HEADER_FILE=\"$(ARM_CPU).h\"
+CXXFLAGS += -DCMSIS_DEVICE_ARM_CORTEX_M_XX_HEADER_FILE=\"$(ARM_CPU)$(CMSIS_ARM_FEATURES).h\"
 
 THIRD_PARTY_CC_SRCS += \
   $(ETHOS_U_CORE_PLATFORM)/retarget.c \

tensorflow/lite/micro/tools/make/targets/cortex_m_generic_makefile.inc

-# Copyright 2021 The TensorFlow Authors. All Rights Reserved.
+# Copyright 2022 The TensorFlow Authors. All Rights Reserved.
 #
 # Licensed under the Apache License, Version 2.0 (the "License");
 # you may not use this file except in compliance with the License.
@@ -86,6 +86,7 @@ else ifeq ($(TARGET_ARCH), cortex-m7+fp)
   ARM_LDFLAGS := -Wl,--cpu=Cortex-M7
   FLOAT=hard
   GCC_TARGET_ARCH := cortex-m7
+  CMSIS_ARM_FEATURES := _DP
 
 else ifeq ($(TARGET_ARCH), cortex-m85)
   CORE=M85