Revert "spi: spi-zynqmp-gqspi: Check for TXFIFO Empty before transfer complete"

commit  a60244f743486300712abea1f6b47b57dc1715ed from
https://github.com/Xilinx/linux-xlnx.git xlnx_rebase_v5.10

This reverts commit 4f4efb2cf1ccb52c1fb5e4c005d192d609f7104b.

This patch checks for TXFIFO & GENFIFO empty, before issuing a transfer
complete to the framework. But the driver was already checking for TXFIFO
& GENFIFO empty before issuing transfer complete. So reverting this patch
as the changes in this patch are redundant.

Signed-off-by: Amit Kumar Mahapatra <amit.kumar-mahapatra@xilinx.com>
State: pending
Signed-off-by: Quanyang Wang <quanyang.wang@windriver.com>