[cpuinfo] Add cpuinfo_cluster.is_power_effiecient field

[digantdesai]

Summary:

• For ARM/ARM64, with Linux or Mach: set to true if the first core in the least capable cluster is a little core, for others: set to false (for now)
• If this is false, then this can be a cluster of big cores, or prime/gold cores
• Renamed and cleaned up midr_score_core() logic to support this use case without altering its original behavior

Test Plan: Since this only works on ARM for now, tested this in Pixel3a and Pixel5 running android Also ran all mock tests for arm64 using Pixel3a

On Pixel3a -

sargo:/data/local/tmp # ./cpu-info
SoC name: Qualcomm Snapdragon 670
Microarchitectures:
        2x Cortex-A75
        6x Cortex-A55r0
Cores:
        0: 1 processor (0), ARM Cortex-A75
        1: 1 processor (1), ARM Cortex-A75
        2: 1 processor (2), ARM Cortex-A55r0
        3: 1 processor (3), ARM Cortex-A55r0
        4: 1 processor (4), ARM Cortex-A55r0
        5: 1 processor (5), ARM Cortex-A55r0
        6: 1 processor (6), ARM Cortex-A55r0
        7: 1 processor (7), ARM Cortex-A55r0
Logical processors (System ID):
        0 (6)
        1 (7)
        2 (0)
        3 (1)
        4 (2)
        5 (3)
        6 (4)
        7 (5)
Clusters:
         cluster id 0 has 2 x       Cortex-A75 [ ]
         cluster id 1 has 6 x     Cortex-A55r0 [ Power Efficient ]

On Pixel5 -

redfin:/data/local/tmp $ ./cpu-info
SoC name: Unknown
Microarchitectures:
    2x Cortex-A76
    6x Cortex-A55
cores:
    0: 1 processor (0), ARM Cortex-A76
    1: 1 processor (1), ARM Cortex-A76
    2: 1 processor (2), ARM Cortex-A55
    3: 1 processor (3), ARM Cortex-A55
    4: 1 processor (4), ARM Cortex-A55
    5: 1 processor (5), ARM Cortex-A55
    6: 1 processor (6), ARM Cortex-A55
    7: 1 processor (7), ARM Cortex-A55
Logical processors (System ID):
    0 (7)
    1 (6)
    2 (0)
    3 (1)
    4 (2)
    5 (3)
    6 (4)
    7 (5)
clusters:
     cluster id 0 has 1 x       Cortex-A76 [ ]
     cluster id 1 has 1 x       Cortex-A76 [ ]
     cluster id 2 has 6 x       Cortex-A55 [ Power Efficient ]

Reviewers: kimishpatel,dreiss Subscribers: Tags: aarch64 Tasks:

[digantdesai]

@kimishpatel - FYI