Add netlink public header library

libwifi-hal-bcm has been using the header via LOCAL_C_INCLUDES. To
convert libwifi-hal-bcm into a Soong module, the header is exposed as a
header lib.

Bug: 239984067
Test: m libwifi-hal-bcm
Change-Id: I92e044565b291c003cff9ac580dd36299fab9851
1 file changed