[PARISC] Update MAINTAINERS and CREDITS

Add Kyle McMartin and Thibaut Varene as maintainers for ALSA ad1889
driver.

Add myself to CREDITS.

Signed-off-by: Kyle McMartin <kyle@parisc-linux.org>
diff --git a/CREDITS b/CREDITS
index a347520..5b1edf3 100644
--- a/CREDITS
+++ b/CREDITS
@@ -2247,6 +2247,12 @@
 S: Syracuse, New York 13206
 S: USA
 
+N: Kyle McMartin
+E: kyle@parisc-linux.org
+D: Linux/PARISC hacker
+D: AD1889 sound driver
+S: Ottawa, Canada
+
 N: Dirk Melchers
 E: dirk@merlin.nbg.sub.org
 D: 8 bit XT hard disk driver for OMTI5520