LAVA Helper: Fix logic to filter device types

Use list comprehension to filter device types in LAVA Helper.
Directly removing items during iteration will lead to some items not
iterated as expected because of the dynamic index.

Signed-off-by: Xinyu Zhang <xinyu.zhang@arm.com>
Change-Id: Id1b557f57567eca1446ffb39563debeae787cb45
1 file changed