EDAC/amd64: Fix intlv_num_chan for Hygon family 18h model 4h

hygon inclusion
category: bugfix
bugzilla: https://gitee.com/openeuler/kernel/issues/I92H9L


CVE: NA

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Make the modification in commit 08fdc64f to intlv_num_chan only
for Hygon family 18h model 4h.

Fixes: 08fdc64f ("EDAC/amd64: Adjust address translation for Hygon family 18h model 4h")
Signed-off-by: Pu Wen <puwen@hygon.cn>