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>
diff --git a/drivers/mmc/host/mmci.h b/drivers/mmc/host/mmci.h
index a76fe10..6bde28c 100644
--- a/drivers/mmc/host/mmci.h
+++ b/drivers/mmc/host/mmci.h
@@ -447,3 +447,9 @@
 #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