find7a: Enable USB OTG

Change-Id: I3d94e384a0d4580c59356908aba8c102a8002ae8
find7a: Use CM's dtbtool

from qcom/common

Change-Id: I3b50c785bc1ecb1fd6381da003888224259e2cc6
Signed-off-by: ayysir <dresadd09691@gmail.com>