There are currently several SME P2P APIs which do not have their
prototypes exported in header files; instead sme_api.c has "extern"
declarations for these APIs. This prevents the compiler from verifying
that the implementations match the declarations, and causes a warning
when the driver is built using -Wmissing-prototypes. To address this
issue properly export all P2P APIs.
Change-Id: I0389ad753993bf9a8a37d8d9ad5ec466b29c74df
CRs-Fixed: 1075575