selftests/powerpc/pmu/: Add interface test for mmcr0_fc56 field using pmc1

The testcase uses event code 0x1001e to verify two bit settings (FC5-6
and PMC1CE) in Monitor Mode Control Register 0 (MMCR0). Check if FC5-6
bit to be set in MMCR0 when not using Performance Monitor Counter 5 and
6 (PMC5 and PMC6). And also PMC1CE is expected to be set when using
PMC1. Test if these fields are programmed correctly via perf interface.

Signed-off-by: Athira Rajeev <[email protected]>
[mpe: Add error checking, drop GET_MMCR_FIELD, add to .gitignore]
Signed-off-by: Michael Ellerman <[email protected]>
Link: https://lore.kernel.org/r/[email protected]

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