perf/amd/ibs: Define macro for ldlat mask and shift

perf/amd/ibs: Define macro for ldlat mask and shift

Load latency filter threshold is encoded in config1[11:0]. Define a mask
for it instead of hardcoded 0xFFF. Unlike "config" fields whose layout
maps to PERF_{FETCH|OP}_CTL MSR, layout of "config1" is custom defined
so a new set of macros are needed for "config1" fields.

Signed-off-by: Ravi Bangoria <ravi.bangoria@amd.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Dapeng Mi <dapeng1.mi@linux.intel.com>
Link: https://patch.msgid.link/20260216042530.1546-2-ravi.bangoria@amd.com