imx: mkimage_fit_atf: fix file size reporting

instead using ls and awk to determine file size use stat instead.
This fixes an invalid size reporting for user or group names that have
spaces in them.

This adds a dependency on the stat application which is part of
the coreutils package which also includes ls.

Signed-off-by: Tim Harvey <tharvey@gateworks.com>

arch/arm/mach-imx/mkimage_fit_atf.sh

@@ -16,7 +16,7 @@ if [ ! -f $BL31 ]; then
 	exit 0
 else
 	echo "$BL31 size: " >&2
-	ls -lct $BL31 | awk '{print $5}' >&2
+	stat -c %s $BL31 >&2
 fi
 
 BL32="tee.bin"
@@ -26,7 +26,7 @@ if [ ! -f $BL32 ]; then
 else
 	echo "Building with TEE support, make sure your $BL31 is compiled with spd. If you do not want tee, please delete $BL31" >&2
 	echo "$BL32 size: " >&2
-	ls -lct $BL32 | awk '{print $5}' >&2
+	stat -c %s $BL32 >&2
 fi
 
 BL33="u-boot-nodtb.bin"
@@ -36,13 +36,13 @@ if [ ! -f $BL33 ]; then
 	exit 0
 else
 	echo "u-boot-nodtb.bin size: " >&2
-	ls -lct u-boot-nodtb.bin | awk '{print $5}' >&2
+	stat -c %s u-boot-nodtb.bin >&2
 fi
 
 for dtname in $*
 do
 	echo "$dtname size: " >&2
-	ls -lct $dtname | awk '{print $5}' >&2
+	stat -c %s $dtname >&2
 done