The intel vulkan driver requires libdrm-intel: Only enable it when
building for x86 or x86-64 similar to DRI drivers.
Building on non-x86* with vulkan leads to "--with-vulkan-drivers= ":
this is interpreted correctly by the build system.
(From OE-Core rev: 8e50f002823772a989f0f39b0ecb8a84517c94f5)
Signed-off-by: Jussi Kukkonen <jussi.kukkonen@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>