Force D0 enabled during device select

[deepikabhavnani]

Resolves ARMmbed/mbed-os#4919

@geky Please verify and review

[geky]

Doesn't seem like it will hurt anything. But out of curiousity why do we need this?

[deepikabhavnani]

Few SPI devices expect a byte before chip select to indicate they are ready for next command, else might drop it. As per SD log, any command after CM25 was either treated as illegal command or was simply dropped.
In normal sequence it was usually CMD17 read block after multi byte transfer, file system does read and somehow device was able to recover during read sequence because host will wait for data. In case of odd bytes transfer CMD25 was followed by CMD24 which result in illegal command and device was unable to recover.

[geky]

Sounds good to me 👍