Bump Security String to 2021-01-05

Implemented:
============
CVE:            References:     Type:   Severity:       Updated AOSP versions:
CVE-2016-6328   A-162602132     RCE     High            8.0, 8.1, 9, 10, 11
CVE-2019-9376   A-129287265     DoS     High            8.0, 8.1, 9
CVE-2020-0471   A-169327567     EoP     High            8.0, 8.1, 9, 10, 11
CVE-2021-0304   A-162738636     ID      High            8.0, 8.1, 9, 10
CVE-2021-0308   A-158063095     EoP     High            8.0, 8.1, 9, 10, 11
CVE-2021-0309   A-158480899     ID      High            8.0, 8.1, 9, 10, 11
CVE-2021-0312   A-170583712     ID      High            8.0, 8.1, 9, 10, 11
CVE-2021-0313   A-170968514     DoS     Critical        8.0, 8.1, 9, 10, 11
CVE-2021-0315   A-169763814     EoP     High            8.0, 8.1, 9, 10, 11
CVE-2021-0316   A-168802990     RCE     Critical        8.0, 8.1, 9, 10, 11

Previously Implemented:
============
CVE:            References:     Type:   Severity:       Updated AOSP versions:
CVE-2020-15999  A-171232105     RCE     Moderate        8.0, 8.1, 9, 10, 11

Not Implemented:
================
CVE:            References:     Type:   Severity:       Updated AOSP versions:
None

Not Applicable (platform source):
=================================
CVE:            References:     Type:   Severity:       Updated AOSP versions:
CVE-2021-0303   A-170407229     EoP     High            11
CVE-2021-0306   A-154505240     EoP     High            8.0, 8.1, 9, 10, 11
CVE-2021-0307   A-155648771     EoP     High            10, 11
CVE-2021-0310   A-170212632     EoP     High            11
CVE-2021-0311   A-170240631     ID      High            8.0, 8.1, 9, 10, 11
CVE-2021-0317   A-168319670     EoP     High            8.0, 8.1, 9, 10, 11
CVE-2021-0318   A-168211968     EoP     High            8.1, 9, 10, 11
CVE-2021-0319   A-167244818     EoP     High            8.0, 8.1, 9, 10, 11
CVE-2021-0320   A-169933423     ID      High            10, 11
CVE-2021-0321   A-166667403     ID      High            11
CVE-2021-0322   A-159145361     ID      High            9, 10, 11

Change-Id: I57503a3bb28a70abfcf344b3a1fb9b3e153a9d1a