Add missing files from caf/ics-chocolate-rb7.2

Add missing files from caf/ics-chocolate-rb7.2: https://www.codeaurora.org/gitweb/quic/la/?p=kernel/msm.git;a=tree;h=refs/heads/ics_chocolate_rb7.2;hb=refs/heads/ics_chocolate_rb7.2
Added:
  - Architectures
  - Platforms
  - xxx_defconfig
  - .gitignore files