Add new Type A connector

See merge request !13

BOM updated by Seeed Studio

1) Add alternative parts
2) Change TI MPN
3) Change LED RES value to modify the brightness

Proposed bom updates

add seeed's Beaglebone black BOM

This is the initial BOM, but Seeed is currently doing some updates.

These parts have been tested in prototype and have been seen to be
functionally equivalent.

Please edit via https://github.com/beagleboard/beaglebone-black/wiki/System-Reference-Manual

See b198d4d9

This reverts commit b198d4d9.