ARM: dts: logicpd-som-lv: Fix pinmux controller references

The pinmux controllers do not themselves need references to
'pinctrl-names' or 'pinctrl-0'

This patch removes some unnecessary typos.

Fixes: 89077c71 ("ARM: dts: Add HSUSB2 EHCI Support to Logic PD DM37xx
SOM-LV")

Signed-off-by: Adam Ford <aford173@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>