tc: increase the uart timeout expectation

scp-boot-tests-coverage is using CodeCoverage fvp plugin and this plugin
slows down the execution significantly which fails the test because of
the uart timeout.
Also, scp-boot-tests fails sometimes for tc2 for the same reason.
Hence, increasing the timeout for uart trace_expect for TC.

Signed-off-by: Mohamed Omar Asaker <mohamed.omarasaker@arm.com>
Change-Id: I9f41f2298d069f322f3b652f8e81602b0400afaf
1 file changed