The "EDIMM STARTER KIT i.Core 1.5 MIPI Evaluation" is based on the 1.5 version
of the i.Core MX6 cpu module. The 1.5 version differs from the original one for
a few details, including the ethernet PHY interface clock provider.

With this commit, the ethernet interface works properly:
SMSC LAN8710/LAN8720 2188000.ethernet-1:00: attached PHY driver

While before using the 1.5 version, ethernet failed to startup do to un-clocked
PHY interface:
fec 2188000.ethernet eth0: could not attach to PHY

Fixes: 3fe08835 ("ARM: dts: imx6q: Add Engicam i.CoreM6 1.5 Quad/Dual MIPI starter kit support")
Reviewed-by: Fabio Estevam <fabio.estevam@nxp.com>
Signed-off-by: Jacopo Mondi <jacopo@jmondi.org>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>