mmc: SDHC 3.0: correct f_min calculation for SD 3.0 spec

While we're at it, add symbols for SDHCI_MAX_DIV_SPEC_{200,300}.

Signed-off-by: Zhangfei Gao <zhangfei.gao@marvell.com>
Signed-off-by: Chris Ball <cjb@laptop.org>
diff --git a/drivers/mmc/host/sdhci.h b/drivers/mmc/host/sdhci.h
index ae28a31..112543a 100644
--- a/drivers/mmc/host/sdhci.h
+++ b/drivers/mmc/host/sdhci.h
@@ -185,6 +185,13 @@
 #define   SDHCI_SPEC_200	1
 #define   SDHCI_SPEC_300	2
 
+/*
+ * End of controller registers.
+ */
+
+#define SDHCI_MAX_DIV_SPEC_200	256
+#define SDHCI_MAX_DIV_SPEC_300	2046
+
 struct sdhci_ops;
 
 struct sdhci_host {