mmc: tegra: allow disabling external clock loopback
Introduce CONFIG_TEGRA124_MMC_DISABLE_EXT_LOOPBACK to disable the external clock loopback and use the internal one on SDMMC3 as per the SDMMC_VENDOR_MISC_CNTRL_0 register's SDMMC_SPARE1 bits being set to 0xfffd according to the TRM. Signed-off-by: NMarcel Ziswiler <marcel.ziswiler@toradex.com> Reviewed-by: NSimon Glass <sjg@chromium.org> Acked-by: NJaehoon Chung <jh80.chung@samsung.com> Signed-off-by: NMarcel Ziswiler <marcel@ziswiler.com> Signed-off-by: NTom Warren <twarren@nvidia.com>
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