colibri_pxa270: drop lzma support for space reason

As the upcoming driver model integration takes up some more precious flash
space first make sure to drop expensive LZMA support.

Signed-off-by: Marcel Ziswiler <marcel.ziswiler@toradex.com>

include/configs/colibri_pxa270.h

@@ -39,7 +39,6 @@
 #define	CONFIG_TIMESTAMP
 #define	CONFIG_CMDLINE_TAG
 #define	CONFIG_SETUP_MEMORY_TAGS
-#define	CONFIG_LZMA			/* LZMA compression support */
 
 /*
  * Serial Console Configuration