Some components were including esp_timer.h without declaring a
dependency on esp_timer component. This used to work due to a
transitive public dependency on esp_timer from freertos component.
Add explicit dependencies where needed.
Also some source files were using esp_timer functions without
including the header file. This used to work because esp_timer.h was
included from freertos port header file. This commit adds esp_timer.h
includes where needed.
The ethernet\iperf example has a bug, once bandwidth is more than 80 Mbits/s the average counter shows wrong total transmitted data value. Issue occur due to overflow of the uint32_t total_len variable.
* created new average formula to avoid the overflow
* updated interval formula according to new variables
* renamed variable according to its purpose
