Revert "Vulkan1.1: CreateInstance downgrades apiVersion for 1.0 ICDs"

The 1.0.2 Vulkan CTS (dEQP) test case "dEQP-VK.api.device_init.create_instance_invalid_api_version" fails because we didn't return INCOMPATIBLE_DRIVER for 1.0.1023 (or something like that).  That is correct for a Vulkan 1.1 instance, and the new 1.1 CTS code doesn't fail for that case.  However, master still has 1.0.2 CTS, and so we need to revert this change for now.

This reverts commit 205e4611.

Change-Id: I1f68cfe6cd5bddef7871929257596f053744c324