[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/MAINTAINERS b/MAINTAINERS
index 767fb61..248b93b 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -197,6 +197,15 @@
 W:	http://linux.thorsten-knabe.de
 S:	Maintained
 
+AD1889 SOUND DRIVER
+P:	Kyle McMartin
+M:	kyle@parisc-linux.org
+P:	Thibaut Varene
+M:	T-Bone@parisc-linux.org
+W:	http://wiki.parisc-linux.org/AD1889
+L:	parisc-linux@lists.parisc-linux.org
+S:	Maintained
+
 ADM1025 HARDWARE MONITOR DRIVER
 P:	Jean Delvare
 M:	khali@linux-fr.org