arm64: dts: imx8mq: disable SuperSpeed instances in park mode

This seem to have solved the issue of the modem disappearing completely
during a usb reset (though doesn't seem to do anything for the resets
themselves).

This change was suggested by Martin Kepplinger in
Librem5/linux-next#197 (comment 114221)
2 jobs for disable_ss_park_mode in 65 minutes and 24 seconds (queued for 1 second)
Status Job ID Name Coverage
  Build
passed #345541
librem5
build:aarch64

00:38:33

passed #345542
librem5:arm64
build:deb

01:05:24