Clear deleted pipeline pointers from draw call data cache

Same pipeline may be cached with different renderpass descriptors
in draw call data cache. Presumably this happens when a pipeline is
compatible with multiple different render passes.

When clearing the cache, check for actual deleted pipelines instead
of just matching descriptor.

Task-number: QDS-2899
Change-Id: Ib1326892dad9a4cf550536b4e06a24073437f7a1
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>