Function EE_PageTransfer

* @brief Transfers last updated variables data from the full Page to * an empty one. * @param VirtAddress: 16 bit virtual address of the variable * @param Data: 16 bit data to be written as variable value * @retval Success or error status: * - FLASH_COMPLETE: on success * - PAGE_FULL: if valid page is full * - NO_VALID_PAGE: if no valid page