Fix I2C controller interrupt to use IRQ_TYPE_LEVEL_HIGH for Broadcom
Cygnus SoC.

Fixes: b51c05a3 ("ARM: dts: add I2C device nodes for Broadcom Cygnus")
Signed-off-by: Ray Jui <ray.jui@broadcom.com>
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>