We are running at MX8MQ_ATF_BL33_BASE_ADDR now, so we can't use
this as a temporary buffer. Add 32MiB to that address and use this
instead. Also copy the piggydata to the place where we expect it
later.

Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Reviewed-by: Rouven Czerwinski <r.czerwinski@pengutronix.de>