[nrfconnect] Added workaround fixing improper select method operation. (#3800)
[nrfconnect] Added workaround fixing improper select method operation. (#3800)

Select method is not working properly, because of the internal Zephyr's
implementation problem with casting timeval types.

* Added compile definition to force using time_t type of size equal
to the long size and fix problem until the real problem solution
will be merged in the Zephyr project.
nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,nestlabs/connectedhomeip,project-chip/connectedhomeip,project-chip/connectedhomeip