Change module CPC calculation

[btian1]

Previously, module CPC is calculated by multiplying the mean
value of cpu_peak with a margin scalar, after internal technical
discussion, change module CPC to the product of maximum value
of module's cpu_peak and the margin scalar, and change the margin
scalar to 1.1 as aligned.

[aiChaoSONG]

Still use CPC_MARGIN? if so, change the commit message accordingly, please. Can you also explain why the Margin is 1.1 now with a comment?

[btian1]

Still use CPC_MARGIN? if so, change the commit message accordingly, please. Can you also explain why the Margin is 1.1 now with a comment?

both Pierre and Liam are suggesting use a CPC margin, Liam suggested more with 10%, so I add 10% as margin.

[btian1]

@marc-hb @aiChaoSONG ， could you check and review this PR?

[aiChaoSONG]

code looks good, suggested commit message:

commit title: tools: sof_perf_analyzer: change module CPC calculation, audio: perf is meaningless, this part is used to point where the code is, or the file you changed.
commit msg:

Previously, module CPC is calculated by multiplying the mean
value of cpu_peak with a margin scalar, after internal technical
discussion, change module CPC to the product of maximum value
of module's cpu_peak and the margin scalar, and change the margin
scalar to 1.1 as aligned.

[btian1]

code looks good, suggested commit message:

commit title: tools: sof_perf_analyzer: change module CPC calculation, audio: perf is meaningless, this part is used to point where the code is, or the file you changed. commit msg:

Previously, module CPC is calculated by multiplying the mean
value of cpu_peak with a margin scalar, after internal technical
discussion, change module CPC to the product of maximum value
of module's cpu_peak and the margin scalar, and change the margin
scalar to 1.1 as aligned.

all changed, please check again.

[aiChaoSONG]

quite simple change, merge now