Add QUANT8_ASYMM_SIGNED support to SELECT op

Also fix repo hook complaining about comment formatting.

Bug: 143935354
Test: NNTest_static and VTS_1_3  with --gtest_filter="*QuantizationCouplingTest*select*"
Change-Id: I1b0d1e987ebccc6700dd172b4222f9996105513d
Merged-In: I1b0d1e987ebccc6700dd172b4222f9996105513d
(cherry picked from commit 04bf939c)