Bump Security String to 2021-03-05

Implemented:
============
CVE:            References:  Type:  Severity:  Updated AOSP versions:
CVE-2017-14491  A-158221622  RCE    High       8.1, 9, 10, 11
CVE-2021-0390   A-174749461  EoP    High       8.1, 9, 10, 11
CVE-2021-0391   A-172841550  EoP    High       8.1, 9, 10, 11
CVE-2021-0392   A-175124730  EoP    High       9, 10, 11
CVE-2021-0393   A-168041375  RCE    High       8.1, 9, 10, 11
CVE-2021-0394   A-172655291  ID     High       8.1, 9, 10, 11
CVE-2021-0396   A-160610106  RCE    High       8.1, 9, 10, 11
CVE-2021-0397   A-174052148  RCE    Critical   8.1, 9, 10, 11

Not Implemented:
================
None

Not Applicable (platform source):
=================================
CVE:            References:  Type:  Severity:  Updated AOSP versions:
CVE-2021-0395   A-170315126  EoP    High       11
CVE-2021-0398   A-173516292  EoP    High       11

Change-Id: I07612f2e57dc4b58699017012195095d6270ca74