MAINTAINERS: Update AMD XGBE driver maintainers

Due to other additional responsibilities Tom would no longer
be able to support AMD XGBE driver.

Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Shyam Sundar S K <Shyam-sundar.S-k@amd.com>
Link: https://lore.kernel.org/r/20230116085015.443127-1-Shyam-sundar.S-k@amd.comSigned-off-by: Jakub Kicinski <kuba@kernel.org>

MAINTAINERS

@@ -1104,7 +1104,6 @@ S:	Supported
 F:	arch/arm64/boot/dts/amd/
 
 AMD XGBE DRIVER
-M:	Tom Lendacky <thomas.lendacky@amd.com>
 M:	"Shyam Sundar S K" <Shyam-sundar.S-k@amd.com>
 L:	netdev@vger.kernel.org
 S:	Supported