staging: mt7621-mmc: Remove power callbacks from msdc_hw

The ext_power_on|off fields of msdc_hw are never set, and only once
checked for not being zero, so they can just be removed.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/board.h

@@ -64,10 +64,6 @@ struct msdc_hw {
 
 	/* config gpio pull mode */
 	void (*config_gpio_pin)(int type, int pull);
-
-	/* external power control for card */
-	void (*ext_power_on)(void);
-	void (*ext_power_off)(void);
 };
 
 extern struct msdc_hw msdc0_hw;

drivers/staging/mt7621-mmc/sd.c

@@ -771,15 +771,9 @@ static void msdc_card_power(struct msdc_host *host, int on)
 
 	if (on) {
 		msdc_pin_config(host, MSDC_PIN_PULL_UP);
-		if (host->hw->ext_power_on)
-			host->hw->ext_power_on();
-		//else
 		//msdc_vdd_on(host);  // need todo card detection.
 		msleep(1);
 	} else {
-		if (host->hw->ext_power_off)
-			host->hw->ext_power_off();
-		//else
 		//msdc_vdd_off(host);
 		msdc_pin_config(host, MSDC_PIN_PULL_DOWN);
 		msleep(1);