ARM: dts: qcom: align SDHCI reg-names with DT schema

DT schema requires SDHCI reg names to be hc/core without "_mem" suffix,
just like TXT bindings were expecting before the conversion.

Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@linaro.org>
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Reviewed-by: Konrad Dybcio <konrad.dybcio@somainline.org>
Signed-off-by: Bjorn Andersson <andersson@kernel.org>
Link: https://lore.kernel.org/r/20220712144245.17417-5-krzysztof.kozlowski@linaro.org