u-boot-boundary: update to f87025237 (v2014.07)

Update to Boundary Devices U-Boot 2014.07 tree.

Notable updates include:
        Switch to v2014.07 release from mainline
        Addition of USB Mass Storage Gadget for programming SD cards/eMMC

Release notes are available in this post:
        http://boundarydevices.com/u-boot-2014-07-release

Specifics (and usage) of USB Mass Storage Gadget are available in
this post:
        http://boundarydevices.com/u-boot-usb-mass-storage-gadget/

Signed-off-by: Eric Nelson <eric.nelson@boundarydevices.com>
Signed-off-by: Otavio Salvador <otavio@ossystems.com.br>