Revert "spi: zynq: Set maximum write size as 0"

This reverts commit 28103b480eb4185470f03c5b608f0972541357c6.

This commit is not required as max_write_size is initalized to 0
in spi_alloc_slave().

This change is not required as equivalent functionality was
introduced by below commit.
"spi: zynq: Use spi_alloc_slave() in each SPI driver"
(sha1: 00e98f66ab2dd60738b657ff645cbcb9477f2037)

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>
Revert "sf: Update the qspi dual parallel flash access logic"

This reverts commit 126774ac78440069441a08907e53f640180a09e6.

This change on dual parallel needs to tune some more extent,
as few of the corner test cases this shows an invalid functionality.

Revert as of now, update this on next comming patch set.

Signed-off-by: Jagannadha Sutradharudu Teki <jaganna@xilinx.com>