Fix strided device address regions in RT misc tests

Fix strided device address regions in RT misc tests

Some strided device address regions in ray tracing misc tests were being
created with the wrong size, not taking into account some tests were
storing several shader group handles in the binding tables.

In addition, this commit also fixes several validation errors in these
tests, related to bad sizes when flusing allocations and unaligned
strides in strided device address regions, which needed to be rounded
up.

Affected tests:
dEQP-VK.ray_tracing_pipeline.misc.*

Components: Vulkan
VK-GL-CTS issue: 3280

Change-Id: I7d20c347ff44b455547115d1a6b94c5d69a46c2c