Fix setting of supported_build_modes

Summary:
While the default of supported build modes is APPLE_BUILD_MODES:
https://www.internalfb.com/code/fbsource/[efcfb52a1dc08d5ca9f9756dcb3719dc455e98fe]/fbcode/buck2/prelude/platforms/apple/platforms.bzl?lines=135%2C155

We pass it an empty list:
https://www.internalfb.com/code/fbsource/[ad8a16ff5bcb0d1f458bc84871d294fefeb1f20d]/fbcode/buck2/prelude/apple/apple_native.bzl?lines=67-69%2C72%2C79

This regressed in D70800926, breaking project generation:
```
error: Object of type `NoneType` has no attribute `raw_target`
  --> xplat/buck2/xcode_project/platforms.bxl:14:33
   |
14 |     target_platforms = {config: platforms.get(config).raw_target() for config in build_configurations.keys()}
   |                                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
   |
```

This is a quick fix to unbreak things. We'll look for a better approach and adding a quicker test in a followup diff.

Reviewed By: ChrisRicca

Differential Revision: D71574440

fbshipit-source-id: 8d04bbe74c06977004c030d34b154c5c6f1025ba

Author: chatura-atapattu

prelude/apple/apple_native.bzl

@@ -64,19 +64,19 @@ def _update_platforms(**kwargs):
         name = kwargs.get("name", "UNKNOWN_TARGET")
         fail("{} has both a default_target_platform and a config_backed_target_platform, which is not allowed".format(name))
 
-    supported_build_modes = kwargs.pop("supported_build_modes", [])
-    if not isinstance(supported_build_modes, list):
-        fail("supported_build_modes must be a list")
+    optional_args = {}
+    if "supported_build_modes" in kwargs:
+        optional_args["supported_build_modes"] = kwargs.pop("supported_build_modes")
 
     if base_config_backed_target_platform != None:
-        default_target_platform = config_backed_apple_target_platform(base_config_backed_target_platform, platform, supported_build_modes = supported_build_modes)
+        default_target_platform = config_backed_apple_target_platform(base_config_backed_target_platform, platform, *optional_args)
     elif default_target_platform == None:
         default_target_platform = get_default_target_platform_for_platform(platform)
 
     if default_target_platform != None:
         kwargs["default_target_platform"] = default_target_platform
 
-    kwargs = set_apple_platforms(platform, base_config_backed_target_platform, kwargs, supported_build_modes = supported_build_modes)
+    kwargs = set_apple_platforms(platform, base_config_backed_target_platform, kwargs, *optional_args)
 
     return kwargs