LU-13798 llite: fix LL_SBI_FLAGS array declaration

LU-13798 llite: fix LL_SBI_FLAGS array declaration

Fix the LL_SBI_FLAGS to string mapping array.  On master this
has "foreign_symlink" and "foreign_symlink_upcall" before the
"parallel_dio" option, but those do not exist on b_es6_0.
Instead, there is "snapshot" in one of those slots, and the
second is unused.

Since these are in-memory flags only, the actual values are
not critical, and there is a patch in-flight to clean up this
code to be more robust.

In the meantime, what is important is that LL_SBI_PARALLEL_DIO
has the proper "parallel_dio" string in the right spot.

Test-Parameters: trivial
Fixes: 00152903a180 ("LU-13798 llite: parallelize direct i/o issuance")
Signed-off-by: Andreas Dilger <adilger@whamcloud.com>
Change-Id: Ie7134c051e85a5a2a90dbeb3145e8d8c09f6d24e
Reviewed-on: https://review.whamcloud.com/44776
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Jian Yu <yujian@whamcloud.com>