BB retimer: Refactor TBT retimer bits
BB retimer: Refactor TBT retimer bits

For DFP, the following bits depend on the Discover Mode SOP
and SOP' response.
Bit 2: RE_TIMER_DRIVER
Bit 17: TBT_TYPE,
Bit 18: CABLE_TYPE,
Bit 20: TBT_ACTIVE_LINK_TRAINING
Bits 29-28: TBT_GEN_SUPPORT
Hence setting these bits accordingly in "retimer_set_state_dfp()"
function.
Ref: Burnside Bridge spec Table 13: Connection state register

BUG=b:152544514
BRANCH=None
TEST=Able to see Thunderbolt getting enumerated on the CPU console

Signed-off-by: Ayushee <5730d7ed61dc96fa04bcc2bc2e4ce32af5b2c19d@intel.com>
Change-Id: I0172cd9c74ba37c0f3e87db55cbd58ebaeef5ebe
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/ec/+/2139281
Reviewed-by: Keith Short <f6d578f97033c25f1206cb57d52f358974c82954@chromium.org>

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