arm64: dts: imx8ulp-evk: Correct Type-C int GPIO flags

arm64: dts: imx8ulp-evk: Correct Type-C int GPIO flags

IRQ_TYPE_xxx flags are not correct in the context of GPIO flags.
These are simple defines so they could be used in DTS but they will not
have the same meaning: IRQ_TYPE_EDGE_FALLING = 2 = GPIO_SINGLE_ENDED.

Correct the Type-C int-gpios to use proper flags, assuming the author of
the code wanted similar logical behavior:

  IRQ_TYPE_EDGE_FALLING => GPIO_ACTIVE_LOW

Fixes: c4b4593ecb0b ("arm64: dts: imx8ulp-evk: enable usb nodes and add ptn5150 nodes")
Cc: stable@vger.kernel.org
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Frank Li <Frank.Li@nxp.com>