Update git submodules

* Update docs/submodules/so/libs.git from branch 'master'
  to 19db86afe558e9f3cde3b307be97b80f7453fdbf
  - Merge "Revome unused code, comments and imports."
  - Revome unused code, comments and imports.
    
    Revome unused code, comments and imports.
    
    Issue-ID: SO-1490
    
    Change-Id: Ic3ef27ba76d06f2f90c4d2bf4128897c049dee83
    Signed-off-by: Isaac Manuel Raj <isaac.manuelraj@huawei.com>
    
1 file changed