V4L/DVB (4533): Tda9887: add configuration setting for L standard PLL gating

Add a tuner config parameter for TDA9887, default_pll_gating_18, that
changes the L standard PLL gating value from 36% to 0% (datasheet says
0%, tda9887 code says 18%).
Turn this on for Microtune 4049FM5, as recomended by tuner datasheet.

Signed-off-by: Trent Piepho <xyzzy@speakeasy.org>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
diff --git a/drivers/media/video/tda9887.c b/drivers/media/video/tda9887.c
index 8dab481..87ffb0e 100644
--- a/drivers/media/video/tda9887.c
+++ b/drivers/media/video/tda9887.c
@@ -480,6 +480,8 @@
 	}
 	if ((t->tda9887_config & TDA9887_INTERCARRIER_NTSC) && (t->std & V4L2_STD_NTSC))
 		buf[1] &= ~cQSS;
+	if (t->tda9887_config & TDA9887_GATING_18)
+		buf[3] &= ~cGating_36;
 	return 0;
 }