MAINTAINERS: move Murali Karicheri to credits

His email bounces with permanent error "550 Invalid recipient". His last
email was from 2020-09-09 on the LKML and he seems to have left TI.

Signed-off-by: Michael Walle <michael@walle.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
diff --git a/CREDITS b/CREDITS
index b06760f..7ef7b13 100644
--- a/CREDITS
+++ b/CREDITS
@@ -1874,6 +1874,11 @@
 S: 181 00 Praha 8
 S: Czech Republic
 
+N: Murali Karicheri
+E: m-karicheri2@ti.com
+D: Keystone NetCP driver
+D: Keystone PCIe host controller driver
+
 N: Jan "Yenya" Kasprzak
 E: kas@fi.muni.cz
 D: Author of the COSA/SRP sync serial board driver.