LAVA: Extend time limit for LAVA jobs

There are only 3 MUSCA_B1 boards on LAVA server for the time being.
Every test on MUSCA_B1 takes about 10mins to run.
About 60 configs on MUSCA_B1 need to be tested in a release job.
Extend time limit for waiting LAVA jobs to 12000 secends
to avoid LAVA tests being cancelled by timeout limits.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: I4b683169f7923e6622ae0dac4f7786b927de1bfc
1 file changed