mmc: sdhci: add const qualifier to the name of struct sdhci_host

This allows to drop annoying (char *) casts when setting the host
name of struct sdhci_host.

Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
diff --git a/include/sdhci.h b/include/sdhci.h
index 23893b5..e0f6667 100644
--- a/include/sdhci.h
+++ b/include/sdhci.h
@@ -235,7 +235,7 @@
 };
 
 struct sdhci_host {
-	char *name;
+	const char *name;
 	void *ioaddr;
 	unsigned int quirks;
 	unsigned int host_caps;