MAINTAINERS: Remove Salil Mehta as HiSilicon HNS3/HNS Ethernet maintainer

MAINTAINERS: Remove Salil Mehta as HiSilicon HNS3/HNS Ethernet maintainer

Closing this chapter and a long wonderful journey with my team, I sign off one
last time with my Huawei email address. Remove my maintainer entry for the
HiSilicon HNS and HNS3 10G/100G Ethernet drivers, and add a CREDITS entry for
my co-authorship and maintenance contributions to these drivers.

Link: https://lore.kernel.org/netdev/259cd032-2ccb-452b-8524-75bc7162e138@huawei.com/
Cc: Jian Shen <shenjian15@huawei.com>
Signed-off-by: Salil Mehta <salil.mehta@huawei.com>
Acked-by: Jijie Shao <shaojijie@huawei.com>
Link: https://patch.msgid.link/20260409000430.7217-1-salil.mehta@huawei.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>