mmc: mmci: Share sdmmc_variant_init() via the common header file

It's good practice to share functions via header files, rather than from
the c-files. Therefore, let's move sdmmc_variant_init() to mmci.h.
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Acked-by: Ludovic Barre <ludovic.barre@st.com>
Tested-by: Ludovic Barre <ludovic.barre@st.com>
Acked-by: Linus Walleij <linus.walleij@linaro.org>

drivers/mmc/host/mmci.c

@@ -52,12 +52,6 @@ void mmci_variant_init(struct mmci_host *host);
 static inline void mmci_variant_init(struct mmci_host *host) {}
 #endif
 
-#ifdef CONFIG_MMC_STM32_SDMMC
-void sdmmc_variant_init(struct mmci_host *host);
-#else
-static inline void sdmmc_variant_init(struct mmci_host *host) {}
-#endif
-
 static unsigned int fmax = 515633;
 
 static struct variant_data variant_arm = {

drivers/mmc/host/mmci.h

@@ -447,3 +447,9 @@ void qcom_variant_init(struct mmci_host *host);
 #else
 static inline void qcom_variant_init(struct mmci_host *host) {}
 #endif
+
+#ifdef CONFIG_MMC_STM32_SDMMC
+void sdmmc_variant_init(struct mmci_host *host);
+#else
+static inline void sdmmc_variant_init(struct mmci_host *host) {}
+#endif