spi: mxic: Fix the transmit path

By working with external hardware ECC engines, we figured out that
Under certain circumstances, it is needed for the SPI controller to
check INT_TX_EMPTY and INT_RX_NOT_EMPTY in both receive and transmit
path (not only in the receive path). The delay penalty being
negligible, move this code in the common path.

Fixes: b942d80b0a39 ("spi: Add MXIC controller driver")
Cc: [email protected]
Suggested-by: Mason Yang <[email protected]>
Signed-off-by: Miquel Raynal <[email protected]>
Reviewed-by: Zhengxun Li <[email protected]>
Reviewed-by: Mark Brown <[email protected]>
Link: https://lore.kernel.org/linux-mtd/[email protected]

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