msm: kgsl: show current power level for 8974 SOCs.

since 8974 uses duplicate frequencies in its table, it's not possible to tell
which of the duplicates is actually in use

Change-Id: I3464d3fe7375c95f9104704ffaa5e64bbf7efe5e
Signed-off-by: Paul Reioux <reioux@gmail.com>