Diffusion FreeBSD src repository - subversion rS282566

Add tools/arm.subr to contain common subroutines used for
rS282566
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Description

Add tools/arm.subr to contain common subroutines used for
building arm images. This is similar to tools/vmimage.subr
used for building virtual machine disk images. By default,
only arm_create_disk() and arm_install_base() contain real
functionality here, and arm_install_uboot() must be overridden
in the arm/KERNEL.conf file.

In release.sh, make create_arm_armv6_build_release() do
something now.

In arm/BEAGLEBONE.conf, set IMAGE_SIZE, PART_SCHEME, FAT_SIZE,
FAT_TYPE, and MD_ARGS, as well as make arm_install_uboot()
functional.

Parts of this were taken from disecting a previous BEAGLEBONE
image, and other parts obtained from Crochet sources.