perf arm-spe: Rename the common data source encoding

perf arm-spe: Rename the common data source encoding

The Neoverse CPUs follow the common data source encoding, and other
CPU variants can share the same format.

Rename the CPU list and data source definitions as common data source
names. This change prepares for appending more CPU variants.

Signed-off-by: Leo Yan <leo.yan@arm.com>
Reviewed-by: James Clark <james.clark@linaro.org>
Link: https://lore.kernel.org/r/20241003185322.192357-3-leo.yan@arm.com
Signed-off-by: Namhyung Kim <namhyung@kernel.org>