imx6sx: Fix i.MX6SX HAB api function table offset

i.MX6SX ROM implements unified table sections.
The HAB function table is at offset 0x100. Update
the HAB function pointers accordingly.

Signed-off-by: Nitin Garg <nitin.garg@freescale.com>
Tested-by: Fabio Estevam <fabio.estevam@freescale.com>