fip: Optimize AMFC compression flag [2/2]

PD#SWPL-194574

Problem:
Optimize AMFC compression flag

Solution:
fixed

Verify:
s7d/s6/t6d

Change-Id: I60593e22575d0b8988c074302900113d88d0f51e
Signed-off-by: wenbo.wang <wenbo.wang@amlogic.com>
diff --git a/s7d/build.sh b/s7d/build.sh
index 6226136..b405dc9 100755
--- a/s7d/build.sh
+++ b/s7d/build.sh
@@ -183,7 +183,7 @@
 	./fip/tools/zstd $1/bl33.bin.org -$comp_lv -o $1/bl33.bin.zstd
 	bin_org_size=`stat -c %s $1/bl33.bin.org`
 	bin_zstd_size=`stat -c %s $1/bl33.bin.zstd`
-	printf "%s" "@ZSTD" >  $amfc_zstd_hdr
+	printf "%s" "ZSTD" >  $amfc_zstd_hdr
 
 	printf "%02x%02x%02x%02x" $[(bin_org_size) & 0xff] \
 	$[((bin_org_size) >> 8) & 0xff] $[((bin_org_size) >> 16) & 0xff] \