drm/i915/xe2hpd: Add new C20 PHY SRAM address

Xe2_HPD has different offsets for C20 PHY SRAM configuration context
location. Use the display version to select the right address.

Note that Xe2_LPD uses the same C20 SRAM offsets used by Xe_LPDP (i.e.
MTL's display). According to the BSpec, currently, only Xe2_HPD has
different offsets, so make sure it is the only display using them in the
driver.

v2:
* Redesigned how the right offsets are selected for different display
IP versions.
v3: Fix white space error(RK)

Bspec: 67610
Cc: Clint Taylor <[email protected]>
Cc: Gustavo Sousa <[email protected]>
Cc: Jani Nikula <[email protected]>
Signed-off-by: Balasubramani Vivekanandan <[email protected]>
Signed-off-by: Lucas De Marchi <[email protected]>
Signed-off-by: Radhakrishna Sripada <[email protected]>
Reviewed-by: Radhakrishna Sripada <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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