drm/i915/icl: Program T_INIT_MASTER registers

This patch programs the time (in escape clocks) to drive
the link in the initialization (i.e. LP-11) state.

v2: Rebase
v3: Remove step hard coding comments (Jani N)

Signed-off-by: Madhav Chauhan <madhav.chauhan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/1537095223-5184-5-git-send-email-madhav.chauhan@intel.com