dt-bindings: mmc: sdhci-msm: fix reg-names entries

Bindings before conversion to DT schema expected reg-names without
"_mem" suffix.  This was used by older DTS files and by the MSM SDHCI
driver.

Reported-by: Douglas Anderson <dianders@chromium.org>
Fixes: edfbf8c307ff ("dt-bindings: mmc: sdhci-msm: Fix issues in yaml bindings")
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Link: https://lore.kernel.org/r/20220712144245.17417-2-krzysztof.kozlowski@linaro.org


Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>