kernel: config: fix missing quote for LESS_GCC_OPT

kernel: config: fix missing quote for LESS_GCC_OPT

Add closing quote for LESS_GCC_OPT.

Change-Id: I6b48b19625ac3ab2cc9f4d651cc216fb890063fa
Signed-off-by: Jong Kim <jongk@nvidia.com>
Reviewed-on: http://git-master/r/131257
Reviewed-by: Automatic_Commit_Validation_User
Reviewed-by: Winnie Hsu <whsu@nvidia.com>
Reviewed-by: Dan Willemsen <dwillemsen@nvidia.com>
Reviewed-by: Allen Martin <amartin@nvidia.com>
Rebase-Id: R3f0f660244fb7e5f29bd8cf4ec480c7d6a19b796