MAINTAINERS: Add an additional maintainer to the AMD XGBE driver

Add Shyam Sundar S K as an additional maintainer to support the AMD XGBE
network device driver.

Cc: Shyam Sundar S K <[email protected]>
Signed-off-by: Tom Lendacky <[email protected]>
Link: https://lore.kernel.org/r/db367f24089c2bbbcd1cec8e21af49922017a110.1657751501.git.thomas.lendacky@amd.com
Signed-off-by: Jakub Kicinski <[email protected]>

Author: tlendacky

MAINTAINERS

@@ -1040,6 +1040,7 @@ F:	arch/arm64/boot/dts/amd/
 
 AMD XGBE DRIVER
 M:	Tom Lendacky <[email protected]>
+M:	"Shyam Sundar S K" <[email protected]>
 L:	[email protected]
 S:	Supported
 F:	arch/arm64/boot/dts/amd/amd-seattle-xgbe*.dtsi