dt-bindings:trivial-devices: Add memsic,mxc4005/mxc6255/mxc6655 entries

Simple devices with I2C interface and single interrupt line so
entries in trivial devices are sufficient.

Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Reviewed-by: Rob Herring <robh@kernel.org>
Link: https://lore.kernel.org/r/20210401174112.320497-5-jic23@kernel.org