Fix layout transitions in dynamic_rendering tests

Fix layout transitions in dynamic_rendering tests

With dynamic rendering, we no longer have initial and final layout
transitions provided automatically as part of vkCmdBeginRendering() and
vkCmdEndRendering().  Instead, it's the responsibility of the client to
get the images into the layout passed to vkCmdBeginRendering().  When
translating from Vulkan 1.0 style subpasses, this means we need to do a
pipeline barrier before and after rendering.

Components: Vulkan

VK-GL-CTS Issue: 3251

Affects: dEQP-VK.renderpass_with_dynamic_rendering.*

Change-Id: I56214198a8b3d81e3030164de045b8ca03a44f88