Exclude generated tests from CPPLINT

Bug: N/A
Test: Running the following command:
$ time python $ANDROID_BUILD_TOP/tools/repohooks/tools/cpplint.py --quiet \
    `find $ANDROID_BUILD_TOP/frameworks/ml -name "*.h" -o -name "*.cpp"`

Produced the following results:
Total errors found: 247

real	0m22.911s
user	0m21.862s
sys	0m1.063s

Change-Id: I46d76b606bcbf9414221e7d3c4261e2bb9c765b2
Merged-In: I46d76b606bcbf9414221e7d3c4261e2bb9c765b2
(cherry picked from commit 840aac3bd3309495ed70a51339b5c3a3aef3b919)
1 file changed