thunderbolt: Move constants for USB4 router operations to tb_regs.h
We are going to use these in subsequent patch so make them available
outside of usb4.c.
Signed-off-by: 
Mika Westerberg <mika.westerberg@linux.intel.com>
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We are going to use these in subsequent patch so make them available
outside of usb4.c.
Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>