phy: core: Define TBT phy_mode

There exist OS-accessible USB4 and Thunderbolt PHYs that need specific
configuration. Define a new phy_mode for them.

Currently, USB4 and TBT3 are defined as submodes, because they're quite
distinct, most visibly in the electrical/analog aspects (slightly
different frequencies, timings, etc.). This results in a need to make
the PHY aware of the actual mode needed (at least in the Qualcomm
implementation, but I believe that'll be a general need).

Newer versions of TBT are basically supersets of USB4 with higher
host-side requirements, so these are not defined. This can always be
changed as necessary.

Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@oss.qualcomm.com>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Konrad Dybcio <konrad.dybcio@oss.qualcomm.com>
Link: https://patch.msgid.link/20260908-topic-usb4phy-v5-2-73aac69578ef@oss.qualcomm.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>

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