arm64: versal-net: Align node names with dt-schema

dt-schema is forcing some rules for node names that's why align them with
it. Labels are not changing that's why this change is not breaking any
other board specific DTSes.

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/102d9499e9bab12f89dbf9ceaa49a11d685146b3.1721054306.git.michal.simek@amd.com