xtensa-build-zephyr.py: Re-add imx8ulp to -all

This re-adds imx8ulp to --all platform list. This was removed
in commit 7737efa ("xtensa-build-zephyr.py: remove imx8ulp from --all")

Signed-off-by: Daniel Baluta <daniel.baluta@nxp.com>

scripts/xtensa-build-zephyr.py

@@ -133,10 +133,6 @@ class PlatformConfig:
 		"hifi4_mscale_v2_0_2_prod",
 		RIMAGE_KEY = "key param ignored by imx8m"
 	),
-}
-
-# These cannot be built out of the box yet
-extra_platform_configs = {
 	"imx8ulp" : PlatformConfig(
 		"imx8ulp", "nxp_adsp_imx8ulp",
 		f"RI-2023.11{xtensa_tools_version_postfix}",
@@ -145,6 +141,10 @@ class PlatformConfig:
 	),
 }
 
+# These cannot be built out of the box yet
+extra_platform_configs = {
+}
+
 platform_configs = platform_configs_all.copy()
 platform_configs.update(extra_platform_configs)