Don't align the MSDOS partition [BeagleBone]

[f-andrey]

I'm see 404dce6#commitcomment-11779116 it's work?

This fix not work for me https://lists.freebsd.org/pipermail/freebsd-arm/2015-June/011568.html BeagleBone black rev a5c (sysutils/u-boot-beaglebone)

[f-andrey]

After this patch boot work https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=183234

[f-andrey]

After r305075 this fixed