radv: Add LLVM version to the device name string

Allows apps to determine the LLVM version so that they can decide
whether or not to enable workarounds for LLVM issues.

Signed-off-by: Alex Smith <asmith@feralinteractive.com>
Cc: "17.2 17.3" <mesa-stable@lists.freedesktop.org>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Tested-by: Dieter Nützel <Dieter@nuetzel-hh.de>
(cherry picked from commit 8fda98c4)
Signed-off-by: Emil Velikov <emil.velikov@collabora.com>

Conflicts:
	src/amd/vulkan/radv_device.c
	src/amd/vulkan/radv_private.h