qemu: rename arc_qemu

Rename recipe to be consistent with other recipes.

Signed-off-by: Anas Nashif <anas.nashif@intel.com>

Author: nashif

meta-zephyr-sdk/recipes-devtools/arc_qemu/files/cross.patch renamed to meta-zephyr-sdk/recipes-devtools/qemu_arc/files/cross.patch

@@ -9,8 +9,8 @@ TOOLCHAIN_HOST_TASK ?= "\
     nativesdk-bossa \
     nativesdk-openocd \
     nativesdk-dtc \
-    nativesdk-arc-qemu \
-    nativesdk-legacy-qemu \
+    nativesdk-qemu-arc \
+    nativesdk-qemu-legacy \
     nativesdk-qemu-zephyr \
     "