UPSTREAM: dm: spi: Return 0 if driver does not implement ops->cs_info

If an SPI controller driver does not implement ops->cs_info, that
probably means any chip select number could be valid, hence le

UPSTREAM: dm: spi: Return 0 if driver does not implement ops->cs_info

If an SPI controller driver does not implement ops->cs_info, that
probably means any chip select number could be valid, hence let's
return 0 for spi_cs_info().

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Tested-by: Jagan Teki <jagan@amarulasolutions.com> # SoPine
Reviewed-by: Jagan Teki <jagan@amarulasolutions.com>
(cherry picked from commit 4dd520b36bce9b35f7a12f3ffd9a95269d425170)
Change-Id: Ie27710ff4328fc6aad4a0ed0f1b29b2aba62fca1
Signed-off-by: Jon Lin <jon.lin@rock-chips.com>

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