board/freescale,lsch3: Add entry for 0.9v

As per updated hardware documentation for
lsch3 based chips like LS2088A, 0.9v support
has been added in possible supported SoC volatges

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