board: ls1028a: Update MAINTAINERS

Update LS1028AQDS, LS10128ARDB board MAINTAINERS
entries to current MAINTAINERS.

Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>

board/freescale/ls1028a/MAINTAINERS

 LS1028AQDS BOARD
-M:	Sudhanshu Gupta <sudhanshu.gupta@nxp.com>
-M:	Rai Harninder <harninder.rai@nxp.com>
 M:	Rajesh Bhagat <rajesh.bhagat@nxp.com>
 M:	Tang Yuantian <andy.tang@nxp.com>
 S:	Maintained
@@ -11,8 +9,6 @@ F:	configs/ls1028aqds_tfa_defconfig
 F:	configs/ls1028aqds_tfa_lpuart_defconfig
 
 LS1028ARDB BOARD
-M:	Sudhanshu Gupta <sudhanshu.gupta@nxp.com>
-M:	Rai Harninder <harninder.rai@nxp.com>
 M:	Rajesh Bhagat <rajesh.bhagat@nxp.com>
 M:	Tang Yuantian <andy.tang@nxp.com>
 S:	Maintained