drm/i915/icl: don't set CNL_DDI_CLOCK_REG_ACCESS_ON anymore

The new recommendation from the spec is to simply not set this bit
anymore. Not setting the bit would prevent some hangs that our driver
manages to avoid since commit c8af5274c3cb ("drm/i915: enable the
pipe/transcoder/planes later on HSW+"), and the theoretical downside
of not setting the bit doesn't seem realistic according to the HW
team. Let's follow their recommendation.

BSpec: 20233
References: commit c8af5274c3cb ("drm/i915: enable the
 pipe/transcoder/planes later on HSW+")
Cc: José Roberto de Souza <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]>
Signed-off-by: Paulo Zanoni <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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