The phyCORE-i.MX 6ULL now comes in a full featured (Y2 variant) and a
low cost (Y0 variant) version. The main difference for the barebox is
the missing second USB OTG port on the Y0 variant and the RAM configuration.

So to account for these differences the existing low cost version is
renamed and the full featured version added.

The results are following phyCORE-i.MX 6ULL modules:

phyCORE-i.MX 6ULL low cost:
	- i.MX 6ULL Y0
	- 256 MB RAM
	- NAND
	- Ethernet 10/100 MBits
	- USB OTG

phyCORE-i.MX 6ULL full featured:
	- i.MX 6ULL Y2
	- 512 MB RAM
	- NAND
	- Ethernet 10/100 MBits
	- USB OTG
	- USB Host

Signed-off-by: Stefan Riedmueller <s.riedmueller@phytec.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>