staging: mt7621-mmc: Remove unused field disable_cd_eirq

The disable_cd_eirq() field of msdc_hw is never set and only once
checked for being non zero, so it is deleted.
Signed-off-by: Christian Lütke-Stetzkamp <christian@lkamp.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

drivers/staging/mt7621-mmc/board.h

@@ -72,9 +72,6 @@ struct msdc_hw {
 	/* external sdio irq operations */
 	void (*enable_sdio_eirq)(void);
 	void (*disable_sdio_eirq)(void);
-
-	/* external cd irq operations */
-	void (*disable_cd_eirq)(void);
 };
 
 extern struct msdc_hw msdc0_hw;

drivers/staging/mt7621-mmc/sd.c

@@ -2466,9 +2466,6 @@ static void msdc_enable_cd_irq(struct msdc_host *host, int enable)
 		sdr_set_bits(MSDC_PS, MSDC_PS_CDEN);
 		sdr_set_bits(MSDC_INTEN, MSDC_INTEN_CDSC);
 		sdr_set_bits(SDC_CFG, SDC_CFG_INSWKUP);  /* not in document! Fix me */
-	} else {
-		if (hw->disable_cd_eirq) {
-			hw->disable_cd_eirq();
 	} else {
 		if (hw->config_gpio_pin) /* NULL */
 			hw->config_gpio_pin(MSDC_CD_PIN, GPIO_PULL_DOWN);
@@ -2482,7 +2479,6 @@ static void msdc_enable_cd_irq(struct msdc_host *host, int enable)
 		 */
 		//msdc_vcore_off(host);
 	}
-	}
 }
 
 /* called by msdc_drv_probe */