platform: msm_shared: Add support for the hs400 config option.

Add a config option to populate the capabilities of host controller
to support HS400 mode.

Change-Id: Ia1ed635b7f95c68e01242a0d3e78e7898b63f37a
diff --git a/platform/msm_shared/mmc_sdhci.c b/platform/msm_shared/mmc_sdhci.c
index 0883c53..d673ee0 100644
--- a/platform/msm_shared/mmc_sdhci.c
+++ b/platform/msm_shared/mmc_sdhci.c
@@ -1025,6 +1025,7 @@
 
 	host->base = cfg->sdhc_base;
 	host->sdhc_event = &sdhc_event;
+	host->caps.hs400_support = cfg->hs400_support;
 
 	data = (struct sdhci_msm_data *) malloc(sizeof(struct sdhci_msm_data));
 	ASSERT(data);