Enable SDHCI using kernel configuration

The following table lists the default values of kernel configuration to enable SD card functionality.

Configuration	Enabled by default (yes/no)	Comments
`CONFIG_MMC`	Yes	Enables MMC driver
`CONFIG_MMC_DEBUG`	No	Enables driver debug messages
`CONFIG_MMC_SDHCI`	Yes	Detects SDHCI driver
`CONFIG_MMC_CQHCI`	Yes	Enables Command Queue Host Control Interface
`CONFIG_MMC_SDHCI_MSM`	Yes	Enables MSM SDHCI driver
`CONFIG_MMC_BLOCK`	Yes	Enables MMC block driver
`CONFIG_MMC_CRYPTO`	Yes	Enables support for the MMC Crypto Engine

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