mmc: renesas_sdhi: remove manual clk handling

The SDHI driver en-/disabled its main clock on its own, e.g. during
probe() and remove(). Now, we leave all handling to RPM.

clk_summary before:
sd0 1 1 0 12480000 0 0 50000
sdif0 2 2 0 12480000 0 0 50000

clk_summary after:
sd0 1 1 0 12480000 0 0 50000
sdif0 1 1 0 12480000 0 0 50000

Reported-by: Geert Uytterhoeven <[e-mail]>
Signed-off-by: Wolfram Sang <[e-mail]>
Link: https://lore.kernel.org/r/[e-mail]
Signed-off-by: Ulf Hansson <[e-mail]>
Tested-by: Geert Uytterhoeven <[e-mail]>

drivers/mmc/host/renesas_sdhi_core.c

···
 {
 	struct mmc_host *mmc = host->mmc;
 	struct renesas_sdhi *priv = host_to_priv(host);
-	int ret = clk_prepare_enable(priv->clk);
-
-	if (ret < 0)
-		return ret;
+	int ret;
 
 	ret = clk_prepare_enable(priv->clk_cd);
-	if (ret < 0) {
-		clk_disable_unprepare(priv->clk);
+	if (ret < 0)
 		return ret;
-	}
 
 	/*
 	 * The clock driver may not know what maximum frequency
···
 {
 	struct renesas_sdhi *priv = host_to_priv(host);
 
-	clk_disable_unprepare(priv->clk);
 	clk_disable_unprepare(priv->clk_cd);
 }