[MTD] CHIPS: add support for switching old SST chips into QRY mode (tested with 39VF3201)

[Guillaume LECERF]

Hi,

SST 39VF160x/39VF320x and some old SST chips need a special command
sequence to enter CFI QueRY mode [1].
This patch adds the relevant sequence to cfi_qry_mode_on().

Signed-off-by: Guillaume LECERF <glecerf at gmail.com>


[1] http://www.sst.com/dotAsset/40479.pdf / Table 6 : Software Command Sequence

-- 
Guillaume LECERF
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