dt-bindings: clk: armada3700: fix typo in SoC name

This documentation is about Armada 3700 SoCs.

Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lkml.kernel.org/r/20190627125245.26788-4-miquel.raynal@bootlin.com


Signed-off-by: Stephen Boyd <sboyd@kernel.org>