Fix multiarch library location on ppc64le systems

Signed-off-by: Timothy Pearson <kb9vqf@pearsoncomputing.net>

usr/share/initramfs-tools/hooks/cryptlukssc

@@ -38,6 +38,12 @@ ARCHDIR=$(uname -i)
 if [ "$ARCHDIR" = "unknown" ]; then
 	ARCHDIR=$(uname -m)
 fi
+if [ "$ARCHDIR" = "ppc64le" ]; then
+	ARCHDIR="powerpc64"
+fi
+if [ "$ARCHDIR" = "ppc64el" ]; then
+	ARCHDIR="powerpc64"
+fi
 
 if [ -e /lib/*${ARCHDIR}*/libgcc_s.so.1 ]
 then