FoE, add variabled for holding the size of received file about soes

[nakarlsson]

****Suggestion of addition to writefile to integrate file verification

struct foe_writefile_cfg
{
/** Name of file to receive from master /
const char * name;
/* Size of file,sizeof data we can recv /
uint32_t max_data;
/* Where to store the data initially /
uint32_t dest_start_address;
/* Current address during write of file /
uint32_t address_offset;
/* Calutlated size of file received /
uint32_t total_size;
/ FoE password /
uint32_t filepass;
/ Pointer to application foe write function _/
uint32_t (_write_function) (foe_writefile_cfg_t * self, uint8_t * data);
/* Pointer to application foe verification function _/
int32_t (_check_function) (foe_writefile_cfg_t * self);
};

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[nakarlsson]

Fixed for PR #32 in 7e380b6