Remove #define CONFIG_CRC32

There is no check for CONFIG_CRC32 so the #define in image.h does
nothing. Remove it.

Reported-by: Robert P. J. Day <rpjday@crashcourse.ca>
Signed-off-by: Chris Packham <judge.packham@gmail.com>
Reviewed-by: Stefano Babic <sbabic@denx.de>
Reviewed-by: Heiko Schocher <hs@denx.de>
diff --git a/include/image.h b/include/image.h
index 54f2b58..bfe4e0b 100644
--- a/include/image.h
+++ b/include/image.h
@@ -68,7 +68,6 @@
 #   define IMAGE_ENABLE_SHA1	1
 #  endif
 # else
-#  define CONFIG_CRC32		/* FIT images need CRC32 support */
 #  define IMAGE_ENABLE_CRC32	1
 #  define IMAGE_ENABLE_MD5	1
 #  define IMAGE_ENABLE_SHA1	1