rolo: fix crc calculation for mi4

crc32gentab() which initilizes crc table was called in bootloader
but not in main binary. Fix this temporary by always calling it in
load_mi4(). The proper fix probably to switch to const table and
drop runtime initialization.

Change-Id: I8b0c2c791642f56ed56189d156647661935a815d

firmware/target/arm/pp/mi4-loader.c

@@ -207,6 +207,8 @@ int load_mi4(unsigned char* buf,
         return EREAD_IMAGE_FAILED;
 
     /* Check CRC32 to see if we have a valid file */
+    chksum_crc32gentab();
+
     sum = chksum_crc32 (buf, mi4header.mi4size - MI4_HEADER_SIZE);
 
     if(sum != mi4header.crc32)