conf/bblayers.conf: Add meta-rust
conf/bblayers.conf: Add meta-rust

Add layer meta-rust which is required for
building RVI SOTA client and its dependecies.

Signed-off-by: Leon Anavi <15d13d7e2c6115f28df053122512bfcb5eb2dbf7@konsulko.com>

Forestscribe/genivi-dev-platform,PeterWinzell/genivi-dev-platform,GENIVI/genivi-dev-platform,gunnarx/genivi-dev-platform,chbae/genivi-dev-platform,Forestscribe/genivi-dev-platform,chbae/genivi-dev-platform,chbae/genivi-dev-platform,DunderRoffe/genivi-dev-platform,gunnarx/genivi-dev-platform,DunderRoffe/genivi-dev-platform,DunderRoffe/genivi-dev-platform,GENIVI/genivi-dev-platform,GENIVI/genivi-dev-platform,Forestscribe/genivi-dev-platform,DunderRoffe/genivi-dev-platform,GENIVI/genivi-dev-platform,PeterWinzell/genivi-dev-platform,PeterWinzell/genivi-dev-platform,chbae/genivi-dev-platform,DunderRoffe/genivi-dev-platform,gunnarx/genivi-dev-platform,gunnarx/genivi-dev-platform