spi: sh-msiof: Document hardware limitations related to chip selects

Guide users to maintain the proper balance between native and GPIO chip
selects.

Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@kernel.org>
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Geert Uytterhoeven 2017-12-13 20:05:13 +01:00 • committed by Mark Brown
commit c99182f73c
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