dt-bindings: altera: Add fallback compatible for Stratix 10 SoCDK eMMC variant

dt-bindings: altera: Add fallback compatible for Stratix 10 SoCDK eMMC variant

Stratix 10 devkit support a separate eMMC daughter card. Add compatible
string for the Stratix 10 SoCDK eMMC daughter board with
"altr,socfpga-stratix10-socdk" as a fallback, since this variant is based
on the standard SoCDK board.

Acked-by: Rob Herring (Arm) <robh@kernel.org>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@oss.qualcomm.com>
Signed-off-by: Ng Tze Yee <tzeyee.ng@altera.com>
Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>