Scale the pressure range's max value.

Since the pressure scale is configurable via a idc property, it isn't
guaranteed to always be [0, 1.0]. Unfortunately, we didn't scale the max
value of the MotionRange so we'd incorrectly return a max pressure of
1.0 for all devices, even when they might exceed that range.

Test: adb push \
    $(gettop)/out/target/product/taimen/data/nativetest/inputflinger_tests/InputReader_test \
    /data/nativetest/inputflinger_tests/InputReader_test &&
    adb shell /data/nativetest/inputflinger_tests/InputReader_test

Change-Id: I7ef174941c4faa7d7efdaa3d69107740f58afd2a