i915/dp/dsc: Add Rate Control Buffer Threshold Registers

Add register defines and  shifts that control the RC buffer threshold
between encoder and decoder for eDP/MIPI and DP cases.

The actual values are calculated usung a helper function.
This patch adds the shifts to registers where the value will
be written during atomic commit.

v2:
- Use _MMIO_PIPE() instead of _MMIO_(_PICK()) (Manasi)
- Combine shifts (Manasi)

Cc: Jani Nikula <[email protected]>
Cc: Ville Syrjala <[email protected]>
Cc: Manasi Navare <[email protected]>
Signed-off-by: Anusha Srivatsa <[email protected]>
Reviewed-by: Manasi Navare <[email protected]>
Signed-off-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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