layers: cv: get rid of device-scoped current renderpass tracking
layers: cv: get rid of device-scoped current renderpass tracking

This was completely redundant to the (correct) CB-scoped renderpass
tracking, and only served to break things when different threads
simultaneously recorded command buffers.

Signed-off-by: Chris Forbes <c3279c50043e18e9442c1ae071cafa0e7a4ca967@google.com>

KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools,KhronosGroup/Vulkan-Tools