MAINTAINERS: phy: Move Kishon Vijay Abraham I to credits

There wasn't much of reviewing activity from Kishon of PHY subsystem
during last few years [1] and last maintainer commit is from 2020, so
move Kishon to Credits to indicate that PHY subsystem has only one
active maintainer.  Thank you Kishon for working on the PHY subsystem
and for all the maintenance effort.

Link: https://lore.kernel.org/all/?q=f%3A%22Kishon+Vijay+Abraham+I%22 [1]
Cc: Kishon Vijay Abraham I <[email protected]>
Cc: Kishon Vijay Abraham I <[email protected]>
Cc: Vinod Koul <[email protected]>
Signed-off-by: Krzysztof Kozlowski <[email protected]>
Link: https://patch.msgid.link/[email protected]
Signed-off-by: Vinod Koul <[email protected]>

Author: krzk

CREDITS

@@ -16,6 +16,10 @@ D: One of assisting postmasters for vger.kernel.org's lists
 S: (ask for current address)
 S: Finland
 
+N: Kishon Vijay Abraham I
+E: [email protected]
+D: Generic Phy Framework
+
 N: Thomas Abraham
 E: [email protected]
 D: Samsung pin controller driver

MAINTAINERS

@@ -10439,7 +10439,6 @@ F:	include/uapi/asm-generic/
 
 GENERIC PHY FRAMEWORK
 M:	Vinod Koul <[email protected]>
-M:	Kishon Vijay Abraham I <[email protected]>
 L:	[email protected]
 S:	Supported
 Q:	https://patchwork.kernel.org/project/linux-phy/list/