Remove direct usages of MoltenVK library functions

These APIs and the related extension are deprecated in favor of the new
metal_objects extension to make sure the loader can intercept them, so that the layers, such as VVL, would work fine.
Removes necessity to load functions directly from a separate dylib.
VK_MVK_moltenvk extension support is still passed to the guest side
due to the existing checks for enabling the AHB extension.

Reviewed-by: Aaron Ruby <aruby@blackberry.com>
Acked-by: Yonggang Luo <luoyonggang@gmail.com>
Acked-by: Adam Jackson <ajax@redhat.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/27246>

src/gfxstream/codegen/scripts/cerealgenerator.py

@@ -120,7 +120,6 @@ SUPPORTED_FEATURES = [
     "VK_KHR_xcb_surface",
     "VK_KHR_win32_surface",
     "VK_EXT_metal_surface",
-    "VK_MVK_moltenvk",
     "VK_EXT_metal_objects",
     "VK_KHR_external_semaphore_win32",
     "VK_KHR_external_memory_win32",
@@ -160,9 +159,6 @@ SUPPORTED_MODULES = {
     "VK_KHR_xcb_surface": ["goldfish_vk_dispatch"],
     "VK_KHR_win32_surface": ["goldfish_vk_dispatch"],
     "VK_EXT_metal_surface": ["goldfish_vk_dispatch"],
-    # VK_MVK_moltenvk doesn't generate a generate dispatch entry for some reason, but should. The
-    # lack of this extension doesn't cause any build failures though.
-    "VK_MVK_moltenvk": ["goldfish_vk_dispatch"],
     "VK_EXT_metal_objects": ["goldfish_vk_dispatch"],
     "VK_KHR_external_semaphore_win32" : ["goldfish_vk_dispatch"],
     "VK_KHR_external_memory_win32" : ["goldfish_vk_dispatch"],