PI and QSPI only work when boot from QSPI on ls1021a.
This patch only enable options in qspi boot defconfig.

Signed-off-by: Haikun Wang <haikun.wang@freescale.com>
Tested-by: Haikun Wang <haikun.wang@freescale.com>
Signed-off-by: Jagan Teki <jteki@openedev.com>