nulldrv: Initialize memory types mask
nulldrv: Initialize memory types mask

Previously apps would randomly succeed or fail to find a matching memory type based on whatever junk happened to be here. Instead, claim to support all memory types.

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

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