ginstall: support fiberjack bootloader updates

The current line of FiberJack products (GFLT110/GFLT120) and the new
Go-Long FiberJack (GFLT300) have their bootloader partition set as
"uboot". Add support to ginstall to properly identify "uboot" as the
FiberJack bootloader partition.

Change-Id: Ie73254e27445a7c5db59f423b270a74dfee343e8
1 file changed