tflite: Format the neuron_delegate_kernel.cc

Format the file with:
cros format delegate/mtk_neuron/neuron_delegate_kernel.cc

And fix the missing header.

BUG=None
TEST=None

Change-Id: I2914f11a36530d0420da5ab8f2704922cd7ab4d4
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/tflite/+/5919105
Tested-by: Yi Chou <yich@google.com>
Commit-Queue: Yi Chou <yich@google.com>
Reviewed-by: Shik Chen <shik@chromium.org>