arm: pmu: Rename ALL_SET, PRE_OVERFLOW, and PRE_OVERFLOW2

Given that the arm PMU tests now handle 64-bit counters and overflows,
it's better to be precise about what the ALL_SET, PRE_OVERFLOW, and
PRE_OVERFLOW2 macros actually are. Given that they are 32-bit counters,
just add _32 to their names.

Signed-off-by: Ricardo Koller <ricarkol@google.com>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Signed-off-by: Andrew Jones <andrew.jones@linux.dev>