fix yoga build issue Could not find yoga:libfb:unspecified.
fix yoga build issue Could not find yoga:libfb:unspecified.

Summary:
Fixes the yoga build 1:15:0 build issue

    Could not find yoga:libfb:unspecified.
    Required by:
    project :app > com.facebook.yoga:yoga:1.15.0

libfb dependency was added to solve import issue in YogaPhantomJNIRefs but since we don't have that file now in codebase , it will not be a problem.

Reviewed By: amir-shalem

Differential Revision: D17395380

fbshipit-source-id: ab8eb2c89afe29b4688787db2214c328d875041e

facebook/css-layout,facebook/yoga,facebook/yoga,facebook/yoga,facebook/yoga,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/css-layout,facebook/css-layout,facebook/css-layout,facebook/yoga,facebook/yoga,facebook/css-layout