geom_part: support < 128 GPT partition entries

[Will Andrews]

Hi,

I'd appreciate a review for: https://reviews.freebsd.org/D6900

Summary:
This change is useful primarily for using GPT on embedded boards like the
pine64 (and others using an Allwinner SoC) that want a firmware image loaded
below sector 34 (8K in that instance).

Note that because this changes g_part_scheme, it breaks the ABI.

Thanks!
-- 
wca
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 181 bytes
Desc: not available
URL: <http://lists.freebsd.org/pipermail/freebsd-current/attachments/20160621/7a7bf646/attachment.sig>