mmc: sdhci: Auto-CMD23 fixes.

Fixes bugs in Auto-CMD23 feature enable decision. Auto-CMD23
should be enabled if host is >= v3, and SDMA is not in use.

USE_ADMA | USE_SDMA | Auto-CMD23
---------+----------+-----------
    0    |    0     |     1
---------+----------+-----------
    0    |    1     |     0
---------+----------+-----------
    1    |    0     |     1
---------+----------+-----------
    1    |    1     |     1
Signed-off-by: Andrei Warkentin <andreiw@motorola.com>
Signed-off-by: Chris Ball <cjb@laptop.org>

drivers/mmc/host/sdhci.c

@@ -2494,9 +2494,9 @@ int sdhci_add_host(struct sdhci_host *host)
 		host->flags |= SDHCI_AUTO_CMD12;
 
 	/* Auto-CMD23 stuff only works in ADMA or PIO. */
-	if ((host->version == SDHCI_SPEC_300) &&
+	if ((host->version >= SDHCI_SPEC_300) &&
 	    ((host->flags & SDHCI_USE_ADMA) ||
-	     !(host->flags & SDHCI_REQ_USE_DMA))) {
+	     !(host->flags & SDHCI_USE_SDMA))) {
 		host->flags |= SDHCI_AUTO_CMD23;
 		DBG("%s: Auto-CMD23 available\n", mmc_hostname(mmc));
 	} else {