CameraITS: change pylab import

It seems like some matplotlib version does not support
"import pylab" so we need to "from matplotlib import pylab"

Test: make -j32 vts && time vts-tradefed run commandAndExit \
vts-camera-its --primary-abi-only
Bug: 31995717
Change-Id: Icc0f1570a8378b37a8c33e17fb21edd2f07547d0
30 files changed