selftests/nolibc: fix EXTRACONFIG variables ordering

The variable block got disordered at some point.

Use the correct ordering.

Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Acked-by: Willy Tarreau <w@1wt.eu>
Tested-by: John Paul Adrian Glaubitz <glaubitz@physik.fu-berlin.de>
Link: https://lore.kernel.org/r/20250623-nolibc-sh-v2-1-0f5b4b303025@weissschuh.net

Author: t-8ch

tools/testing/selftests/nolibc/Makefile.nolibc

@@ -119,10 +119,10 @@ DEFCONFIG_sparc64    = sparc64_defconfig
 DEFCONFIG_m68k       = virt_defconfig
 DEFCONFIG            = $(DEFCONFIG_$(XARCH))
 
-EXTRACONFIG_m68k      = -e CONFIG_BLK_DEV_INITRD
-EXTRACONFIG           = $(EXTRACONFIG_$(XARCH))
 EXTRACONFIG_arm       = -e CONFIG_NAMESPACES
 EXTRACONFIG_armthumb  = -e CONFIG_NAMESPACES
+EXTRACONFIG_m68k      = -e CONFIG_BLK_DEV_INITRD
+EXTRACONFIG           = $(EXTRACONFIG_$(XARCH))
 
 # optional tests to run (default = all)
 TEST =