thunderbolt: Move NVM upgrade support flag to struct icm

This is depends on the controller and on the platform/CPU we are
running. Move it to struct icm so we can set it per controller.

Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Reviewed-by: Yehezkel Bernat <YehezkelShB@gmail.com>
Tested-by: Mario Limonciello <mario.limonciello@dell.com>