powerpc/rtas_flash: Update return token comments

#define VALIDATE_READY	       -1001 /* Firmware image ready for validation */

#define VALIDATE_PARAM_ERR     -3    /* RTAS Parameter Error */

#define VALIDATE_HW_ERR        -1    /* RTAS Hardware Error */

#define VALIDATE_TMP_UPDATE    0     /* Validate Return Status */

#define VALIDATE_FLASH_AUTH    1     /* Validate Return Status */

#define VALIDATE_INVALID_IMG   2     /* Validate Return Status */

#define VALIDATE_CUR_UNKNOWN   3     /* Validate Return Status */

#define VALIDATE_TMP_COMMIT_DL 4     /* Validate Return Status */

#define VALIDATE_TMP_COMMIT    5     /* Validate Return Status */

#define VALIDATE_TMP_UPDATE_DL 6     /* Validate Return Status */

/* ibm,validate-flash-image update result tokens */

#define VALIDATE_TMP_UPDATE    0     /* T side will be updated */

#define VALIDATE_FLASH_AUTH    1     /* Partition does not have authority */

#define VALIDATE_INVALID_IMG   2     /* Candidate image is not valid */

#define VALIDATE_CUR_UNKNOWN   3     /* Current fixpack level is unknown */

/*

 * Current T side will be committed to P side before being replace with new

 * image, and the new image is downlevel from current image

 */

#define VALIDATE_TMP_COMMIT_DL 4

/*

 * Current T side will be committed to P side before being replaced with new

 * image

 */

#define VALIDATE_TMP_COMMIT    5

/*

 * T side will be updated with a downlevel image

 */

#define VALIDATE_TMP_UPDATE_DL 6

/* ibm,manage-flash-image operation tokens */

#define RTAS_REJECT_TMP_IMG   0