message: Update xtensa-xpg build args for optimization.
diff: @@ -11,7 +11,9 @@ ifeq ($(TARGET), xtensa-xpg)
  -DNDEBUG \
  -DTF_LITE_MCU_DEBUG_LOG \
  --xtensa-core=$(XTENSA_CORE) \
  - -g -O2 \
  + -mcoproc \
  + -O3 \
  + -DXTENSA -DMAX_RFFT_PWR=9 -DMIN_RFFT_PWR=MAX_RFFT_PWR -fdata-sections \
  -fmessage-length=0
  TARGET_TOOLCHAIN_PREFIX := xt-
  