MAINTAINERS: Add Prashanth as additional maintainer for amd-xgbe driver

Add Prashanth as an additional maintainer for the amd-xgbe Ethernet
driver to help with ongoing development and maintenance.

Cc: Prashanth Kumar K R <PrashanthKumar.K.R@amd.com>
Signed-off-by: Raju Rangoju <Raju.Rangoju@amd.com>
Link: https://patch.msgid.link/20260406073816.3218387-1-Raju.Rangoju@amd.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>

Author: RajuRangoju

MAINTAINERS

@@ -1291,6 +1291,7 @@ F:	include/uapi/drm/amdxdna_accel.h
 
 AMD XGBE DRIVER
 M:	Raju Rangoju <Raju.Rangoju@amd.com>
+M:	Prashanth Kumar K R <PrashanthKumar.K.R@amd.com>
 L:	netdev@vger.kernel.org
 S:	Maintained
 F:	arch/arm64/boot/dts/amd/amd-seattle-xgbe*.dtsi