lib/lzma.c: Use header over .c include

Change-Id: I904eb1703eaf4f8de1b4ec443173686c7985be12
Signed-off-by: Edward O'Callaghan <eocallaghan@alterapraxis.com>
Reviewed-on: http://review.coreboot.org/7427
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Marc Jones <marc.jones@se-eng.com>
Tested-by: build bot (Jenkins)

src/lib/lzma.c

@@ -9,11 +9,12 @@
  *
  */
 
-#include "lzmadecode.c"
 #include <console/console.h>
 #include <string.h>
 #include <lib.h>
 
+#include "lzmadecode.h"
+
 unsigned long ulzma(unsigned char * src, unsigned char * dst)
 {
 	unsigned char properties[LZMA_PROPERTIES_SIZE];