Link libwifi-system-iface instead

This commit replaces libwifi-system with libwifi-system-iface because
libwifi-system is a framework-only library.

Bug: 37429084
Test: Sailfish builds, boots, and wifi works.
Change-Id: I2b7c68d60ee84d3dba7500d01323365a699e4ad4
2 files changed