libfdt: Verify alignment of sub-blocks in dtbHEADmastermain

A dtb is considered malformed if its structural elements (not things within
property values) are not naturally aligned.  This means that the structure
block must be aligned to a 32-bit boundary, the reserve map must be aligned
to  64-bit boundary and the whole thing must be loaded at a 64-bit aligned
address.  We currently verify that lasat condition in fdt_check_header()
but not the other cases.

Reported-by: Owen Sanzas (Ze Sheng) 盛泽 <zesheng@tamu.edu>
Link: https://github.com/dgibson/dtc/issues/178
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>

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