arm64: xilinx: Do not use '_' in si5335 DT node names

Character '_' not recommended in node name. Use '-' instead.
Pretty much run sed below for node names.
s/si5335_/si5335-/

Signed-off-by: Michal Simek <michal.simek@amd.com>
Link: https://lore.kernel.org/r/ac752b1e27f02efb32608188992bb7ae50e4b1b0.1695809130.git.michal.simek@amd.com