fsl/qe: add bit description for SYNL register for GUMR

Add the bitmask for the two bit SYNL register according to the QUICK
Engine Reference Manual.
Signed-off-by: NHolger Brunck <holger.brunck@keymile.com>
Cc: Zhao Qiang <qiang.zhao@nxp.com>
Signed-off-by: NDavid S. Miller <davem@davemloft.net>

include/soc/fsl/qe/qe.h

@@ -668,6 +668,10 @@ struct ucc_slow_pram {
 #define UCC_FAST_GUMR_CTSS	0x00800000
 #define UCC_FAST_GUMR_TXSY	0x00020000
 #define UCC_FAST_GUMR_RSYN	0x00010000
+#define UCC_FAST_GUMR_SYNL_MASK	0x0000C000
+#define UCC_FAST_GUMR_SYNL_16	0x0000C000
+#define UCC_FAST_GUMR_SYNL_8	0x00008000
+#define UCC_FAST_GUMR_SYNL_AUTO	0x00004000
 #define UCC_FAST_GUMR_RTSM	0x00002000
 #define UCC_FAST_GUMR_REVD	0x00000400
 #define UCC_FAST_GUMR_ENR	0x00000020