spi: Kconfig: Mark SOFT_SPI as DEPRECATED

Mark SOFT_SPI as DEPRECATED, this so the resulting build shows
warning for deprecated configuration enabled and associated code
will remove in v2019.07 release.

Cc: Vasily Khoruzhick <anarsoul@gmail.com>
Signed-off-by: Jagan Teki <jagan@amarulasolutions.com>
[trini: Switch to DEPRECATED]
Signed-off-by: Tom Rini <trini@konsulko.com>
1 file changed