wireless-regdb: Add Guyana (GY) regulatory rules

Source is QCA's regulatory team's efforts and email confirmation from
ministry that spectrum rules are based upon FCC 15.247 for bands
2400-2483.5 MHz and 5725-5850 MHz. NFMU.Gov.GY

Signed-off-by: Jouni Malinen <jouni@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/db.txt b/db.txt
index b06fb2b..9864027 100644
--- a/db.txt
+++ b/db.txt
@@ -366,6 +366,10 @@
 	(5490 - 5730 @ 80), (24), DFS
 	(5735 - 5835 @ 80), (30)
 
+country GY:
+	(2402 - 2482 @ 40), (30)
+	(5735 - 5835 @ 80), (30)
+
 country HN: DFS-FCC
 	(2402 - 2482 @ 40), (20)
 	(5170 - 5250 @ 80), (17)