Push wpa_supplicant modules down to the leaf product config.

Since 558477c0b2a5a7db679c1ad7551d43e6364d1df2 in
external/wpa_supplicant_8 we don't need those modules if
WPA_SUPPLICANT_VERSION is not set by the BoardConfig.mk.

Change-Id: Ib5cf26814300e209590ecde2ca816e6648f00066

Conflicts:
	device.mk
Remove linux/android_pmem.h include.

This file is not needed any more, and does not exist in uapi kernel headers.

Change-Id: I930e2bbf98a89ac3e0162bb2df039d1f286ddd76