wifi: Set the mode at native layer

 * Set normal/AP mode so that the HAL can specify correct module
   arguments when loading the driver.

Change-Id: Ic460f00f0308840d4875582673020786e46258f7
IPV6 tethering: Check info for null before removeUpstreamV6Interface

When tethering on dual stack networks such as verizon wireless and
sending or recieving MMS you get an null pointer exception and hard
reboot.

It starts to go wrong here:
10-14 19:11:51.375: E/Mms/smil(28035): Failed to parse SMIL document.
10-14 19:11:51.375: E/Mms/smil(28035): org.xml.sax.SAXParseException:
expected start tag notEND_DOCUMENT null@1:1 in java.io.InputStreamReader
@4192ada0

And then:
10-14 19:11:55.559: E/AndroidRuntime(23125): java.lang.NullPointerException
10-14 19:11:55.559: E/AndroidRuntime(23125):    at com.android.server.
connectivity.Tethering$TetherMasterSM$TetherModeAliveState.processMessage
(Tethering.java:1573)

Which is line 1573 of:

https://github.com/CyanogenMod/android_frameworks_base/blob/cm-10.2/services/java/com/android/server/connectivity/Tethering.java#L1573

CMD_UPSTREAM_CHANGED's message.obj can be null (line 776).

Change-Id: I13d531d398f2e33a828c6e81f25f4b2a27518d34
base: IPV6 tethering support

Added two APIs addUpstreamV6Interface and removeUpstreamV6Interface,
required to pass the interfaces to use to the Router Advertisement
Proxy.
Added a dun entry to the networkAttributes value in
res/values/config.xml.
This is to allow tethering to work with the dunRequired property.
Added dun to allowable tether upstream type.
Enabled debug flags for debug logging inside framework components.
Regardless of MOBILE_TYPE_DUN APN being available, if dun_required
flag is not set, fall back to HIPRI as a preferred APN for the
embedded data call.
Debug logging was enabled by default which was causing security
vulnerabilities. This patch disables debug logging.

CRs-fixed: 555006
Change-Id: Idb0971449473554bcd749d478563db7ba351d55d
Acked-by: Subash Abhinov Kasiviswanathan <subashab@qti.qualcomm.com>
(cherry picked from commit 43bac130e4bab1c12792d29042f85c6a10372553)
(cherry picked from commit be8491aa9d82177c200eab1af713244a7bbbdcfc)