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Convert all selinux_android_restorecon and _setfilecon calls to new API.

libselinux selinux_android_restorecon API is changing to the more
general interface with flags and dropping the older variants.

Also get rid of the old, no longer used selinux_android_setfilecon API
and rename selinux_android_setfilecon2 to it as it is the only API in use.

Change-Id: I3fc390656c662630381361406dd7f0336aff641c
Signed-off-by: Stephen Smalley <sds@tycho.nsa.gov>