mmc: core: Remove unused host cap MMC_CAP2_BROKEN_VOLTAGE

#define MMC_CAP2_HS200_1_2V_SDR	(1 << 6)        /* can support */

#define MMC_CAP2_HS200		(MMC_CAP2_HS200_1_8V_SDR | \

				 MMC_CAP2_HS200_1_2V_SDR)

#define MMC_CAP2_BROKEN_VOLTAGE	(1 << 7)	/* Use the broken voltage */

#define MMC_CAP2_HC_ERASE_SZ	(1 << 9)	/* High-capacity erase size */

#define MMC_CAP2_CD_ACTIVE_HIGH	(1 << 10)	/* Card-detect signal active high */

#define MMC_CAP2_RO_ACTIVE_HIGH	(1 << 11)	/* Write-protect signal active high */