Update rpp-lib and test-sw (Ethernet support)

Update rpp-lib and test-sw (Ethernet support)

Submodule rpp/lib 7f10fea..300b193:
  > Increase FreeRTOS heap and use it by LwIP
  > Increase stack memory of RX and TX thread
  > Get rid of "last line of file ends without a newline" warning
  > Update LWIP
  > Set MDIO initial sequence
  > Change RMII comunication to MII
  > Makefile.var: Whitespace fixes
  > Enable ethernet interrupts for all platforms
  > Add content to release
  > Static IP configuration
  > Touch PIN_ETHRST only on TMS570_RPP
  > Enable ehternet for all platform
  > Heap change

Submodule doc/test-sw ee9f11e..8514824:
  > Add testing tool iperf
  > Get rid of compiler warnings (variable was set but never used)
  > Add ping function to debug tools
  > Change MAC address
  > Guard tms570_rpp-specific code with #ifdef
  > Enable Ethernet on all boards
  > Update rpp-lib