mmc: davinci: prepare clock

When trying to use this driver with the common clock framework, enabling
the clock fails because it was not prepared. This fixes the problem by
calling clk_prepare and clk_enable in a single function. Ditto for
clk_disable_unprepare.

Signed-off-by: David Lechner <[e-mail]>
Signed-off-by: Ulf Hansson <[e-mail]>

drivers/mmc/host/davinci_mmc.c

···
 		ret = PTR_ERR(host->clk);
 		goto clk_get_fail;
 	}
-	ret = clk_enable(host->clk);
+	ret = clk_prepare_enable(host->clk);
 	if (ret)
-		goto clk_enable_fail;
+		goto clk_prepare_enable_fail;
 
 	host->mmc_input_clk = clk_get_rate(host->clk);
 
···
 cpu_freq_fail:
 	davinci_release_dma_channels(host);
 dma_probe_defer:
-	clk_disable(host->clk);
-clk_enable_fail:
+	clk_disable_unprepare(host->clk);
+clk_prepare_enable_fail:
 clk_get_fail:
 ioremap_fail:
 	mmc_free_host(mmc);
···
 	mmc_remove_host(host->mmc);
 	mmc_davinci_cpufreq_deregister(host);
 	davinci_release_dma_channels(host);
-	clk_disable(host->clk);
+	clk_disable_unprepare(host->clk);
 	mmc_free_host(host->mmc);
 
 	return 0;