CS_P_ESP_LWIP -> CS_P_ESP8266;add CS_P_NXP_KINETIS

LWIP part has been finally fully split from the ESP part, and ESP
platform defs reduced to bare minimum. It is now possible to use LWIP
in either low-level or socket mode without any ESP dependencies,
and NXP Kinetis platform is the first to make use of it.

PUBLISHED_FROM=4a9055897609c812296bdab5b4943ffde641ced2

examples/ESP8266_RTOS/user/Makefile

@@ -25,7 +25,7 @@ endif
 #
 DEFINES += -DCS_PLATFORM=3 \
            -DMG_NO_BSD_SOCKETS=1 \
-           -DRTOS_SDK -DMG_LWIP -DLWIP_TIMEVAL_PRIVATE=0 \
+           -DRTOS_SDK \
            -DMG_INTERNAL=
 
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