arm64: dts: add support for Macchiatobin Single Shot board

Add DT support for the Macchiatobin Single Shot board from SolidRun,
which is similar to the Double Shot board, but does not have the
10G 3310 PHYs - the two ethernet ports are instead connected directly
to the SFP+ cages.

Signed-off-by: Russell King <rmk+kernel@armlinux.org.uk>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>