Bump Security Patch Level to 2018-12-01

CVE-2018-9548	A-112555574	High     Change 239033
CVE-2018-9549	A-112160868	Critical Change 239038
CVE-2018-9552	A-113260892	Critical Change 239039
CVE-2018-9553	A-116615297	High     No external/libvpx in M
CVE-2018-9554	A-114770654	High     No IMediaExtractor.cpp
CVE-2018-9555	A-112321180	Critical No fn. l2c_lcc_proc_pdu
CVE-2018-9557	A-35385357	High     Not publicly available
CVE-2018-9558	A-112161557	High     Change 240414
CVE-2018-9559	A-112731440	High     Change 239042
CVE-2018-9566	A-74249842	High     Change 239041

Reference Version: 7.0

Change-Id: Ia9f18c3af1ab3e49d49da698bb64e0ea04c43607