ARM: dts: cubox-i: add eSATA DT configuration

Add the transmit level, boost and attenuation parameters necessary for
the eSATA interface on Cubox-i to work.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Shawn Guo <shawn.guo@freescale.com>