mmc: sdhci-st: drop of_match_ptr from of_device_id table

The driver can match only via the DT table so the table should be always
used and the of_match_ptr does not have any sense (this also allows ACPI
matching via PRP0001, even though it is not relevant here).  This fixes
compile warning (!CONFIG_OF on x86_64):

    drivers/mmc/host/sdhci-st.c:512:34: warning:
        ‘st_sdhci_match’ defined but not used [-Wunused-const-variable=]

Signed-off-by: Krzysztof Kozlowski <krzk@kernel.org>
Link: https://lore.kernel.org/r/20201120162344.485921-2-krzk@kernel.org
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
diff --git a/drivers/mmc/host/sdhci-st.c b/drivers/mmc/host/sdhci-st.c
index 4e9ff3e..962872a 100644
--- a/drivers/mmc/host/sdhci-st.c
+++ b/drivers/mmc/host/sdhci-st.c
@@ -523,7 +523,7 @@ static struct platform_driver sdhci_st_driver = {
 		   .name = "sdhci-st",
 		   .probe_type = PROBE_PREFER_ASYNCHRONOUS,
 		   .pm = &sdhci_st_pmops,
-		   .of_match_table = of_match_ptr(st_sdhci_match),
+		   .of_match_table = st_sdhci_match,
 		  },
 };