boards: arm: Fix conditionalized pinmuxes for shared pin

A change was put in to conditionalize pinmuxes based on
Ethernet configuration but for the IMXRT1050/60/64-EVK
boards the USER_LED and ENET_RST share the same GPIO.
Samples like blinky would not work on these boards.

The change is to not conditionalize the shared pin.

fixes: #27473

Signed-off-by: David Leach <david.leach@nxp.com>