gem_wsim: Distinguish particular engines during calculating nop calibration.

Extend handling -n parameter by accepting multiple values of per
engine nop calibration. Add raw numbers handling to set default
calibration values. Print copyable and pastable string with
calibrations. Allow to switch between calculating in parallel
or doing it sequentially.

Accepted input values:
-n 123456
All calibrations will be set to 123456.

-n ENG=value,ENG2=value2,value3
i.e.
-n RCS=123456,BCS=345678,999999
RCS engine's value is set to 123456, BCS engine's value is set to
345678, 999999 is copied to rest of engines. All engines must be set;
you can either provide values for each of the engines, or you can set
specific values and provide a default value for the others.

-n value,ENG1=value1,ENG2=value2
First, value is copied to all engines, then value1 overrides ENG1, and
finally value2 overrides ENG2.

New output follows the pattern:
Nop calibrations for 1000us delay is: <eng1>=<v1>,<eng2>=<v2>,...
So you can easily copy-paste it to the next invocation.

Switching between calculation modes:
Run program with -T parameter to calculate calibrations in parallel.
The calculations are performed sequentially by default.

v2: Get rid of trailing whitespaces. Skip DEFAULT and VCS engines
when printing out calibrations. Reject them in the string passed
to -n. Re-align rest of help text. Fix accepting unknown engines.

v3: Consider all cases of arguments
for -n (Tvrtko).

-n 10 (raw number)
-n RCS (engine without calib)
-n AA (neither the engine nor the number)
-n RCS=500 (valid eng=val pair)
-n RCS=AA (calib is not a number)
-n XYZ=10 (engine is not an engine)
-n XYZ=AA (combo)

v4: Print calculated values (Chris). Do not make any assumptions
about the order of the engines (Tvrtko).

v5: Suppress the output with -q (Chris).

Cc: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Signed-off-by: Anna Karas <anna.karas@intel.com>
Reviewed-by: Tvrtko Ursulin <tvrtko.ursulin@intel.com>
[tursulin: fixup mixed plural and singular use in print_engine_calibrations]

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