[manuf] do not erase flash info page 0 in CP init

[timothytrippel]

The CP init binary currently erases flash info page 0 and reconfigures its settings before writing the DeviceID, manuf state, and AST configuration data to it. It is possible however that some of this data may be written to flash info page 0 during CP calibration stage. Therefore, during CP init stage, flash info page 0 should be buffered to SRAM before reconfiguring and writing any additional data to the page.

[timothytrippel]

@benjbender: is only the AST calibration data going to written during CP calibration phase?