Adds option to force using AMD_DEVICE_COHERENT_MEMORY
for debug printf buffer to print messages
even if VK_ERROR_DEVICE_LOST is encountered.

* Option added to layer json to be visible in vkconfig,
* Forcing extension and device feature if not enabled by application,
* Added workaround for atomic operations in uncached memory
being in cache anyway,
* Added workaround to failing MapMemory after
DEVICE_LOST (occurs on AMD): When using uncached buffer,
do not unmap buffer until messages are analyzed.