mtd: spi-nor: spansion: Add a new ->ready() hook for multi-chip device

For multi-chip devices, we need to make sure the all dice in the device
are ready. The cypress_nor_sr_ready_and_clear() reads SR in each die and
returns true only when all dice are ready. This function also takes care
for program or erase error handling by reusing spansion_nor_clear_sr().
To do that, spansion_nor_clear_sr() is moved to top.

Signed-off-by: Takahiro Kuwano <Takahiro.Kuwano@infineon.com>
Link: https://lore.kernel.org/r/3e4a64613ee733e002279349c75083433be45bf5.1680849425.git.Takahiro.Kuwano@infineon.com
Signed-off-by: Tudor Ambarus <tudor.ambarus@linaro.org>

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