spi: dw: use irq handler for enhanced spi

Introduce the interrupt handler for enhanced spi to read or write based
on the generated irq. Also, use the xfer_completion from spi_controller
to wait for a timeout or completion from irq handler.

In enhanced mode we need to calculate RXFTLR based on the length of data
we are expecting to receive or the fifo length.

Signed-off-by: Sudip Mukherjee <sudip.mukherjee@sifive.com>
Co-developed-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Signed-off-by: Changhuang Liang <changhuang.liang@starfivetech.com>
Link: https://patch.msgid.link/20260803124044.156998-9-changhuang.liang@starfivetech.com
Signed-off-by: Mark Brown <broonie@kernel.org>

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