drm/i915/icl: Disable master intr before reading

Disable master interrupt before reading level indications.
This will close a race where we get a level indication between
reading and disabling, generating an extra interrupt where we
could have avoided one.

Further, as the reading acts also as a post, replace the
write/post on the irq reset with the helper. On enabling side,
posting doesn't serve any purpose so it can also be replaced
with helper.

Cc: Chris Wilson <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: Daniele Ceraolo Spurio <[email protected]>
Signed-off-by: Mika Kuoppala <[email protected]>
Acked-by: Chris Wilson <[email protected]>
Reviewed-by: Daniele Ceraolo Spurio <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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