Use littlefs-python instead of mklittlefs #272

Job	Run time
build-component (release-v4.3, esp32)	1m 40s
build-component (release-v4.4, esp32)	3m 44s
build-tests (v4.3.3)	2m 44s
build-tests (v4.4.1)	2m 24s
build-tests (latest)	3m 2s
build-component (release-v5.0, esp32)	3m 38s
build-component (latest, esp32)	3m 13s
build-component (release-v4.4, esp32s2)	3m 3s
build-component (release-v4.4, esp32c3)	2m 57s
build-component (release-v4.4, esp32s3)	3m 18s
	29m 43s

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