mmc: sdhci_am654: Make symbol 'sdhci_am654_ops' static

Fixes the following sparse warning:

drivers/mmc/host/sdhci_am654.c:161:18: warning:
 symbol 'sdhci_am654_ops' was not declared. Should it be static?

Fixes: aff88ff23512 ("mmc: sdhci_am654: Add Initial Support for AM654 SDHCI driver")
Signed-off-by: Wei Yongjun <weiyongjun1@huawei.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>

drivers/mmc/host/sdhci_am654.c

@@ -158,7 +158,7 @@ static void sdhci_am654_set_power(struct sdhci_host *host, unsigned char mode,
 	sdhci_set_power_noreg(host, mode, vdd);
 }
 
-struct sdhci_ops sdhci_am654_ops = {
+static struct sdhci_ops sdhci_am654_ops = {
 	.get_max_clock = sdhci_pltfm_clk_get_max_clock,
 	.get_timeout_clock = sdhci_pltfm_clk_get_max_clock,
 	.set_uhs_signaling = sdhci_set_uhs_signaling,