Minix 3/src 39d31d9releasetools arm_sdimage.sh

ARM: Remove dependency on mtools

Instead of formatting the image, and then using the mtools to copy on it
the boot partition files, we use makefs to directly generate the
partition.

Change-Id: I468e3100842177f3f55edbfdb910941bafa576ba
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+52-83releasetools/arm_sdimage.sh
+52-831 files

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