drm/i915: Configure AUX_CH_CTL when enabling the AUX power domain

Most of the AUX_CH_CTL flags are concerned with DP AUX transfer
parameters. As opposed to this the flag specifying the thunderbolt vs.
non-thunderbolt mode of the port is not related to AUX transfers at all
(rather it's repurposed to enable either TBT or non-TBT PHY HW blocks).
The programming has to be done before enabling the corresponding AUX
power well, so make it part of the power well code.

v3:
- Use existing enable/disable helpers instead of opencoding. (Jose)
- Fix type of is_tc_tbt to remain a bitfield. (Lucas)
- Add comment describing the is_tc_tbt power well flag. (Lucas)

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=108548
Cc: Paulo Zanoni <[email protected]>
Cc: Ville Syrjälä <[email protected]>
Cc: José Roberto de Souza <[email protected]>
Cc: Lucas De Marchi <[email protected]>
Cc: Rodrigo Vivi <[email protected]>
Signed-off-by: Imre Deak <[email protected]>
Reviewed-by: José Roberto de Souza <[email protected]>
Reviewed-by: Rodrigo Vivi <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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