dt-bindings: sdhci-omap: Document ti,non-removable property as deprecated

dt-bindings: sdhci-omap: Document ti,non-removable property as deprecated

Nowadays the standard non-removable property should be used, but we
still need to parse the ti,non-removable too. Let's document it as a
deprecated property.

Cc: Rob Herring <robh+dt@kernel.org>
Cc: devicetree@vger.kernel.org
Suggested-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Tony Lindgren <tony@atomide.com>
Link: https://lore.kernel.org/r/20210924073441.7835-1-tony@atomide.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>