lib: sbi_pmu: Fix counter and event info error codes as per SBI v3.0 specHEADmaster

Align the PMU extension implementation with the error codes required
by the SBI v3.0 specification, chapter 11:

 - sbi_pmu_counter_start and sbi_pmu_counter_stop (secs 11.9-11.10,
   tables 39-42): the start_flags/stop_flags bits 2:(XLEN-1) are
   reserved and must be zero, so return SBI_ERR_INVALID_PARAM when any
   reserved flag bit is set. Introduce SBI_PMU_START_FLAGS_MASK and
   SBI_PMU_STOP_FLAGS_MASK for the valid bits of each function.

 - sbi_pmu_counter_start and sbi_pmu_counter_stop (tables 40 and 42):
   return SBI_ERR_ALREADY_STARTED / SBI_ERR_ALREADY_STOPPED when the
   set of counters includes a counter which is already started or
   stopped, instead of ignoring the error returned for each counter.

 - sbi_pmu_event_get_info (sec 11.14, table 47): the output word must
   indicate whether the event is supported, but firmware events were
   only matched against the hardware event map and were always
   reported as unsupported. Report a validated firmware event as
   supported.

Signed-off-by: David E. Garcia Porras <[email protected]>
Reviewed-by: Anup Patel <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Anup Patel <[email protected]>

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