ARM: dts: Remove non-existent i2c1 from 98dx3236

The switches with integrated CPUs have only got a single i2c controller.
They incorrectly gained one when they were split from the Armada-XP.

Fixes: 43e28ba8 ("ARM: dts: Use armada-370-xp as a base for armada-xp-98dx3236")
Signed-off-by: Chris Packham <chris.packham@alliedtelesis.co.nz>
Reviewed-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: Gregory CLEMENT <gregory.clement@bootlin.com>