Besides converting the LS-XHL and LS-CHLv2 to generic board, fix a typo
which accidentally reverted the bootsource to 'hdd' although the default
bootsource should be 'legacy'.
Cc: Tom Rini <trini@ti.com> Cc: Prafulla Wadaskar <prafulla@marvell.com> Signed-off-by: Michael Walle <michael@walle.cc> Signed-off-by: Prafulla Wadaskar <prafulla@marvell.com>