Revert "mmc: tmio-mmc: Remove .set_pwr() callback from platform data"

This reverts commit 3af9d15c719017feb63fa99f89ac6009a5a3d467, which
causes a build failure:

drivers/mfd/asic3.c:724:2: error: unknown field 'set_pwr' specified in initializer
diff --git a/drivers/mmc/host/tmio_mmc_pio.c b/drivers/mmc/host/tmio_mmc_pio.c
index 67a3bf1..b380225 100644
--- a/drivers/mmc/host/tmio_mmc_pio.c
+++ b/drivers/mmc/host/tmio_mmc_pio.c
@@ -777,6 +777,9 @@
 
 	/* .set_ios() is returning void, so, no chance to report an error */
 
+	if (host->set_pwr)
+		host->set_pwr(host->pdev, 1);
+
 	if (!IS_ERR(mmc->supply.vmmc)) {
 		ret = mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, vdd);
 		/*
@@ -810,6 +813,9 @@
 
 	if (!IS_ERR(mmc->supply.vmmc))
 		mmc_regulator_set_ocr(mmc, mmc->supply.vmmc, 0);
+
+	if (host->set_pwr)
+		host->set_pwr(host->pdev, 0);
 }
 
 /* Set MMC clock / power.
@@ -996,6 +1002,7 @@
 	_host->pdev = pdev;
 	platform_set_drvdata(pdev, mmc);
 
+	_host->set_pwr = pdata->set_pwr;
 	_host->set_clk_div = pdata->set_clk_div;
 
 	/* SD control register space size is 0x200, 0x400 for bus_shift=1 */