Zynq:NAND: Add PS7_NAND flash support

Signed-off-by: Jason Wu <huanyu@xilinx.com>
Zynq:NOR: Add PS7_NOR flash support

Signed-off-by: Jason Wu <huanyu@xilinx.com>
Zynq:NAND: Define the SMC base memory address

The SMC base memory address is required to compile the nand driver.
Variable XILINX_PS7_SMC_BASEADDR is used to define it.

Signed-off-by: Jason Wu <huanyu@xilinx.com>
Zynq:NOR: Generate NOR flash size in xparameters.h file

define XILINX_PS7_NOR_FLASH_SIZE variable to the NOR flash size.

also correct the variable name to nor_* (from nand_*)

Signed-off-by: Jason Wu <huanyu@xilinx.com>