2lib: Add gbb flag to enforce CSE sync The CSE sync process executes a CSE upgrade exclusively when the CSE version stored in CBFS CSE differs from the current CSE. Given the infrequency of CSE upgrades, we may not always able to test the cse sync flow. This patch incorporates a GBB flag, which, when enabled, enforces CSE sync even if the current CSE version matches the version in CBFS. BUG=b:353053317 TEST=Able to build domika Change-Id: I4d3b56b2bd259ffd6b8b8c57ab35ad6a0f080de9 Signed-off-by: Dinesh Gehlot <[email protected]> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/5718196 Reviewed-by: Yu-Ping Wu <[email protected]> Reviewed-by: Subrata Banik <[email protected]> Commit-Queue: Yu-Ping Wu <[email protected]> Tested-by: Subrata Banik <[email protected]> Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/vboot_reference/+/5896363 Reviewed-by: Jayvik Desai <[email protected]>