scsi: dt-bindings: ufs: Add sm8150 compatible string

Document "qcom,sm8150-ufshc" compatible string for UFS HC found on SM8150.

Link: https://lore.kernel.org/r/20191024074802.26526-2-vkoul@kernel.orgReviewed-by: Bjorn Andersson <bjorn.andersson@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Acked-by: Rob Herring <robh@kernel.org>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Documentation/devicetree/bindings/ufs/ufshcd-pltfrm.txt

@@ -13,6 +13,7 @@ Required properties:
 			    "qcom,msm8996-ufshc", "qcom,ufshc", "jedec,ufs-2.0"
 			    "qcom,msm8998-ufshc", "qcom,ufshc", "jedec,ufs-2.0"
 			    "qcom,sdm845-ufshc", "qcom,ufshc", "jedec,ufs-2.0"
+			    "qcom,sm8150-ufshc", "qcom,ufshc", "jedec,ufs-2.0"
 - interrupts        : <interrupt mapping for UFS host controller IRQ>
 - reg               : <registers mapping>