The code represent memory/cache level data based on PERF_MEM_LVL_*
namespace, which is in the process of deprication in the favour of
newer composite PERF_MEM_{LVLNUM_,REMOTE_,SNOOPX_,HOPS_} fields.
Add data source encodings to represent cache/memory data based on
newer composite PERF_MEM_{LVLNUM_,REMOTE_,SNOOPX_,HOPS_} fields.

Add data source encodings to represent data coming from local
memory/Remote memory/distant memory and remote/distant cache hits.

In order to represent data coming from OpenCAPI cache/memory, we use
LVLNUM "PMEM" field which is used to present persistent memory accesses.

Result in power10 system with patch changes:

localhost:# ./perf mem report --sort="mem,sym,dso" --stdio
 # Overhead       Samples  Memory access             Symbol                      Shared Object
 # ........  ............  ........................  ..........................  ................
 #
    29.46%          2331  L1 or L1 hit              [.] __random                                     libc-2.28.so
    23.11%          2121  L1 or L1 hit              [.] producer_populate_cache                      producer_consumer
    18.56%          1758  L1 or L1 hit              [.] __random_r                                   libc-2.28.so
    15.64%          1559  L2 or L2 hit              [.] __random                                     libc-2.28.so
    .....
    0.09%              5  Remote socket, same board Any cache hit             [.] __random         libc-2.28.so
    0.07%              4  Remote socket, same board Any cache hit             [.] __random         libc-2.28.so
    .....
Signed-off-by: Kajol Jain <kjain@linux.ibm.com>
Reviewed-by: Madhavan Srinivasan <maddy@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20211206091749.87585-5-kjain@linux.ibm.com