ARM: dts: imx6: phyFLEX: fix typo in "pinctrl-names"

Fix a typo, replacing "pinctrl-name" by "pinctrl-names"
in the Phytec phyFLEX-i.MX6 Quad dtsi.

Also fix a typo in the board name

Signed-off-by: Michael Opdenacker <michael.opdenacker@free-electrons.com>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>