MAINTAINERS: update maintainers for Microchip LAN78xx

Woojung Huh seems to have only replied to the list 35 times
in the last 5 years, and didn't provide any reviews in 3 years.
The LAN78XX driver has seen quite a bit of activity lately.

gitdm missingmaints says:

Subsystem USB LAN78XX ETHERNET DRIVER
  Changes 35 / 91 (38%)
  (No activity)
  Top reviewers:
    [23]: andrew@lunn.ch
    [3]: horms@kernel.org
    [2]: mateusz.polchlopek@intel.com
  INACTIVE MAINTAINER Woojung Huh <woojung.huh@microchip.com>

Move Woojung to CREDITS and add new maintainers who are more
likely to review LAN78xx patches.

Acked-by: Woojung Huh <woojung.huh@microchip.com>
Acked-by: Rengarajan Sundararajan <rengarajan.s@microchip.com>
Link: https://patch.msgid.link/20250108155242.2575530-3-kuba@kernel.org


Signed-off-by: Jakub Kicinski <kuba@kernel.org>