spi: zynq_qspi: Use correct mask value for config register.

Read the qspi config register from previous SW and
assign the below mask values on zynq_qspi_init_hw
- (1 << 31) : Flash interface mode
- (1 << 15) : Manual start enable
- (1 << 14) : Manual chip select
- (1 << 10) : Peri chip select
- (0x3 << 6): FIFO width
- (1 << 0)  : Mode select

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>
sf: Fix build warnings

Move few macro definations to spi_flash local headers:
In file included from spi_flash.c:14:0:
include/spi_flash.h:42:12: warning: 'spi_write_cmds_array' defined but not used [-Wunused-variable]
include/spi_flash.h:59:12: warning: 'spi_read_cmds_array' defined but not used [-Wunused-variable]
In file included from zynq_qspi.c:20:0:
include/spi_flash.h:42:12: warning: 'spi_write_cmds_array' defined but not used [-Wunused-variable]
include/spi_flash.h:59:12: warning: 'spi_read_cmds_array' defined but not used [-Wunused-variable]
In file included from cmd_sf.c:11:0:
include/spi_flash.h:42:12: warning: 'spi_write_cmds_array' defined but not used [-Wunused-variable]
include/spi_flash.h:59:12: warning: 'spi_read_cmds_array' defined but not used [-Wunused-variable]
In file included from env_sf.c:31:0:
include/spi_flash.h:42:12: warning: 'spi_write_cmds_array' defined but not used [-Wunused-variable]
include/spi_flash.h:59:12: warning: 'spi_read_cmds_array' defined but not used [-Wunused-variable]

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Signed-off-by: Michal Simek <michal.simek@xilinx.com>