Add wificond to Android makefiles

wificond is part of the framework, and shouldn't be modified by
vendor. The patch adds wificond to PRODUCT_PACKAGES list of
Android makefile, and removes it from treble_common.mk.

Bug: 62646878
Test: Build and check the file existance in system image
Change-Id: I92f2b64c1912ed5106a72a56e831bc989a70979e