kernel: add a missing kconfig symbol for 2.6.38

SVN-Revision: 26417

target/linux/generic/config-2.6.38

@@ -1167,6 +1167,7 @@ CONFIG_JOLIET=y
 # CONFIG_KERNEL_GZIP is not set
 CONFIG_KERNEL_LZMA=y
 # CONFIG_KERNEL_LZO is not set
+# CONFIG_KERNEL_XZ is not set
 # CONFIG_KEXEC is not set
 # CONFIG_KEYBOARD_ADP5588 is not set
 # CONFIG_KEYBOARD_ATKBD is not set