x86/mce: Define BSP-only init

Currently, MCA initialization is executed identically on each CPU as
they are brought online. However, a number of MCA initialization tasks
only need to be done once.

Define a function to collect all 'global' init tasks and call this from
the BSP only. Start with CPU features.

Signed-off-by: Yazen Ghannam <yazen.ghannam@amd.com>
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Reviewed-by: Tony Luck <tony.luck@intel.com>
Reviewed-by: Nikolay Borisov <nik.borisov@suse.com>
Tested-by: Tony Luck <tony.luck@intel.com>
Link: https://lore.kernel.org/20250908-wip-mca-updates-v6-0-eef5d6c74b9c@amd.com

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