EDAC/amd64: Adjust UMC channel for Hygon family 18h model 6h

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


CVE: NA

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Hygon family 18h model 6h has 2 cs mapped to 1 umc, so adjust for it.

Fixes: 950b6f3c ("EDAC/amd64: Add support for Hygon family 18h model 6h")
Signed-off-by: Pu Wen <puwen@hygon.cn>