Make system.img the right size for the device #4
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In some builds (especially very early / testing ones), the Android
system.imgcan take up a lot of space. Rootstock-touch-install doesn't account for this and just makes a 160MB one no matter what. This patch useswcto get the size of the sparsesystem.imgand makes the contiguous image this size. This way we won't run into strange errors such aserror: ext4_allocate_best_fit_partial: failed to allocate 48 blocks, out of space?.