TBT/USB4: Add support for non-Thunderbolt typec cables
TBT/USB4: Add support for non-Thunderbolt typec cables

Passive cables that don't support Intel SVID should enter into
Thunderbolt/USB4 mode at speed from Discover Identity SOP',
USB Highest Speed field and and active cables that don't support
Intel SVID shouldn't enter into Thunderbolt mode.
Ref: TBT4 PD Discovery Flow Application Notes Revision 0.9, Figure 2

BUG=b:180950931
BRANCH=None
TEST=1. With USB4 Gen3 cables not supporting Intel SVID, able to enter
        into USB4/TBT mode at 40Gbps.
     2. With USB4 Gen 2 cables not supporting Intel SVID, able to enter
        into USB/TBT mode at 20Gbps.

Change-Id: I2c94cf84706dc345306a038b15f49b70aa13515a
Signed-off-by: Ayushee Shah <5730d7ed61dc96fa04bcc2bc2e4ce32af5b2c19d@intel.com>
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2733450
Reviewed-by: Abe Levkoy <2e1ad7039298f93262cf06bbb457275fb3e2ecb5@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec