meson: Don't enable any vulkan drivers on arm, aarch64

There's no Vulkan support for arm atm.
Signed-off-by: Guido Günther <guido.gunther@puri.sm>
Reviewed-by: Dylan Baker <dylan@pnwbakers.com>

meson.build

@@ -179,6 +179,8 @@ if _vulkan_drivers.contains('auto')
   if system_has_kms_drm
     if host_machine.cpu_family().startswith('x86')
       _vulkan_drivers = ['amd', 'intel']
+    elif ['arm', 'aarch64'].contains(host_machine.cpu_family())
+      _vulkan_drivers = []
     else
       error('Unknown architecture @0@. Please pass -Dvulkan-drivers to set driver options. Patches gladly accepted to fix this.'.format(
             host_machine.cpu_family()))