drm/i915/icp: Add Interrupt Support

This patch addresses Interrupts from south display engine (SDE).

ICP has two registers - SHOTPLUG_CTL_DDI and SHOTPLUG_CTL_TC.
Introduce these registers and their intended values.

Introduce icp_irq_handler().

The icp_irq_postinstall() takes care of
enabling all PCH interrupt sources, to unmask
them as needed with SDEIMR, as is done
done by ibx_irq_pre_postinstall() for earlier platforms.
We do not need to explicitly call the ibx_irq_pre_postinstall().

Also, while changing these,
s/CPT/PPT/CPT-CNP comment.

v2:
- remove redundant register defines.(Lucas)
- Change register names to be more consistent with
previous platforms (Lucas)

v3:
-Reorder bit defines to a more appropriate location.
 Change the comments. Confirm in the commit message that
 icp_irq_postinstall() need not go to
 ibx_irq_pre_postinstall() and ibx_irq_postinstall()
 as in earlier platforms. (Paulo)

Cc: Lucas De Marchi <[email protected]>
Cc: Paulo Zanoni <[email protected]>
Cc: Dhinakaran Pandiyan <[email protected]>
Cc: Ville Syrjala <[email protected]>
Reviewed-by: Lucas De Marchi <[email protected]>
Reviewed-by: Paulo Zanoni <[email protected]>
Signed-off-by: Anusha Srivatsa <[email protected]>
[Paulo: coding style bikesheds and rebases].
Signed-off-by: Paulo Zanoni <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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