msm: defconfig: Set performance governor as default governor for 8916

Currently ondemand governor is set as default governor so set
performance governor as default governor to make it consistent
with other chipsets.

Change-Id: I7d57b1a1ce3944e424dcfbe107006e2d8808e13c
Signed-off-by: Prasad Sodagudi <psodagud@codeaurora.org>