sdhci_fsl_fdt: Implement pulse width detection errata
Some boards do not detect pulse width reliably.
Implement workaround by writing 0 to special register.
Apply errata for board by adding flag to chosen soc specific data.
Obtained from: Semihalf
Sponsored by: Alstom Group
Reviewed by: mw, manu
Differential Revision: https://reviews.freebsd.org/D33222