sf: Add INFO6 flash_info macro

sf: Add INFO6 flash_info macro

INFO6 is for tabulating 6 byte flash parts, Ex: S25FS256S_64K

Cc: Bin Meng <[email protected]>
Cc: York Sun <[email protected]>
Cc: Vignesh R <[email protected]>
Cc: Mugunthan V N <[email protected]>
Cc: Michal Simek <[email protected]>
Cc: Siva Durga Prasad Paladugu <[email protected]>
Signed-off-by: Jagan Teki <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Reviewed-by: Jagan Teki <[email protected]>
Tested-by: Jagan Teki <[email protected]>