drm: bridge: dw-hdmi: Extract PHY interrupt setup to a function

In preparation for adding PHY operations to handle RX SENSE and HPD,
group all the PHY interrupt setup code in a single location and extract
it to a separate function.

Signed-off-by: Laurent Pinchart <[email protected]>
Reviewed-by: Jose Abreu <[email protected]>
[narmstrong: renamed dw_hdmi_fb_registered to dw_hdmi_setup_i2c]
Reviewed-by: Archit Taneja <[email protected]>
Signed-off-by: Neil Armstrong <[email protected]>

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