DO NOT MERGE ANYWHERE. Remove duplicate styleable declaration

Apps that depend on preference-v14 must depend on preference-v7,
which already defines the exact same styleable.

BUG=27850894

Change-Id: Ia10d4ea4d99b76e05bac361a1daf085379b86ca6
(cherry picked from commit 55c0e2c729deff4b3092afcabccdd5959c00d57f)
1 file changed