dt-bindings: i2c: aspeed: Drop stray '#interrupt-cells'

'#interrupt-cells' is not documented which causes a warning when
'unevaluatedProperties' is implemented. Unless the I2C controller is
also an interrupt controller, '#interrupt-cells' is not valid. This
doesn't appear to be the case from the driver, so just remove it from
the example.

Cc: Brendan Higgins <[email protected]>
Cc: Benjamin Herrenschmidt <[email protected]>
Cc: Joel Stanley <[email protected]>
Cc: Andrew Jeffery <[email protected]>
Cc: Rayn Chen <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Signed-off-by: Rob Herring <[email protected]>
Reviewed-by: Thierry Reding <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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