psi: created const for pmt with time and gps program inormation length

stream/mts/psi/std.go

@@ -26,6 +26,10 @@ LICENSE
 
 package psi
 
+const (
+	pmtTimeGpsPil = 44
+)
+
 // Some common manifestations of PSI
 var (
 	// PSI struct to represent basic pat
@@ -85,8 +89,8 @@ var (
 			Sn:   0,
 			Lsn:  0,
 			Sd: &PMT{
-				Pcrpid: 0x0100, // wrong
-				Pil:    10,
+				Pcrpid: 0x0100,
+				Pil:    pmtTimeGpsPil,
 				Pd: []Desc{
 					Desc{
 						Dt: byte(timeDescTag),