dt-bindings: mmc: sdhci-msm: Document the Lemans compatible

Add the MSM SDHCI compatible name to support both eMMC and SD card for
Lemans, which uses 'sa8775p' as the fallback SoC. Ensure the new
compatible string matches existing Lemans-compatible formats without
introducing a new naming convention.

The SDHCI controller on Lemans is based on MSM SDHCI v5 IP. Hence,
document the compatible with "qcom,sdhci-msm-v5" as the fallback.

Signed-off-by: Monish Chunara <quic_mchunara@quicinc.com>
Acked-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Signed-off-by: Wasim Nazir <wasim.nazir@oss.qualcomm.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>