[U-Boot] sf: Remove spansion_s25fss_disable_4KB_erase

[york sun]

On 12/12/2016 09:32 PM, Yao Yuan wrote:
> Hi Jagan,
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> Do you have any comments?
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> Thanks for your work and you know it’s important for QSPI with S25FS512S.
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> It seems S25FS512S can’t support the SECT_4K, right?
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> And it better to retain the disable_4kb, but we can add a flag in dts to
> select whether enable it.
>
>

Jagan,

This is blocking me from using the board with this specific flash chip. 
Can you take a look? By reverting this single commit 116e005c, my board 
works again.

York