dt-bindings: i2c: microchip,corei2c: Fix indentation of compatible items

make dt_binding_check:

    Documentation/devicetree/bindings/i2c/microchip,corei2c.yaml:19:9: [warning] wrong indentation: expected 10 but found 8 (indentation)

Fixes: f1bd6661 ("dt-bindings: i2c: add bindings for microchip mpfs i2c")
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>
Acked-by: Rob Herring <robh@kernel.org>
Acked-by: Conor Dooley <conor.dooley@microchip.com>
Signed-off-by: Wolfram Sang <wsa@kernel.org>