This reverts commit 54784ff2.

This patch changes the pin names from "MIO%d" to "MIO-%d", but all dts
in arch/arm64/boot/dts/xilinx still use the old name. As a result my
ZCU104 has no output on serial terminal and is not reachable over
network.
Signed-off-by: NGerhard Engleder <gerhard@engleder-embedded.com>
Signed-off-by: NAndy Shevchenko <andriy.shevchenko@linux.intel.com>