board/ls2081ard: Correct code to get QMAP value in checkboard

board/ls2081ard: Correct code to get QMAP value in checkboard

QMAP value contains information about QSPI chip-selects. These bits
are used to display information of boot device in checkboard()
function.

QMAP value is stored in most significant 3-bits of 8-bit register
brdcfg[0] in Qixis, this patch corrects code to get QMAP bits using
below logic:
	(brdcfg[0] >> 5) & 0x7

Signed-off-by: Priyanka Jain <priyanka.jain@nxp.com>
Reviewed-by: York Sun <york.sun@nxp.com>