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Tests have shown that entering pfm mode when there is more than one
cpu running at 300Mhz causes instability.

Update the current required at 300Mhz to 400mA so that pfm mode is
entered only when one cpu is online and is running at 300Mhz.

This 400mA is a temporary placeholder and will be a updated when
HW is characterized.

Change-Id: I93d5630ff9e797c981db3d64c5d71097dba9f3fc
Signed-off-by: Abhijeet Dharmapurikar <adharmap@codeaurora.org>