ibmpex: correct power use multipliers for QS2x blade

The QS2x blades ships with v2.54 of the firmware, which use the same
multiplier for all power meters.

Signed-off-by: Darrick J. Wong <djwong@us.ibm.com>
Cc: Mark M. Hoffman <mhoffman@lightlink.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>