spi_qsd: Support delay per transfer if requested by the client

Client has ability to request delay per transfer through SPI
framework. SPI controller driver needs to put this delay after every
transfer. However, this also means that multiple transfers per message
cannot be combined to be able to insert this delay per transfer.
CS will be de-asserted after completion of each transfer
on older version of QUP/SPI core.

CRs-fixed: 416186
Change-Id: Id9266ce7043e020fa7e1233c66baba30ba3d496c
Signed-off-by: Gilad Avidov <gavidov@codeaurora.org>
Signed-off-by: Sagar Dharia <sdharia@codeaurora.org>
Signed-off-by: Alok Chauhan <alokc@codeaurora.org>