EDAC/{skx_common,skx,i10nm}: Split skx_set_decode()

EDAC/{skx_common,skx,i10nm}: Split skx_set_decode()

skx_set_decode() currently handles both address decoding and Retry
Read error Log (RRL) reporting, coupling two independent functions
in a single API. This complicates setup/teardown and forces callers
to update unrelated state.

Introduce skx_set_show_rrl() and keep skx_set_decode() focused on
decode setup, allowing decode and RRL handling to be managed
independently.

Also rename the callback type and variable to skx_show_rrl_f and
show_rrl for clearer RRL terminology and consistency.

No functional changes intended.

Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Signed-off-by: Tony Luck <tony.luck@intel.com>
Tested-by: Yi Lai <yi1.lai@intel.com>
Link: https://patch.msgid.link/20260521073112.3881223-3-qiuxu.zhuo@intel.com