x86/microcode: Remove remaining references to CONFIG_MICROCODE_AMD

Commit e6bcfdd ("x86/microcode: Hide the config knob") removed the
MICROCODE_AMD config, but left some references in defconfigs and comments,
that have no effect on any kernel build around.

Clean up those remaining config references. No functional change.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230825141226.13566-1-lukas.bulwahn@gmail.com

arch/x86/configs/i386_defconfig

@@ -33,7 +33,6 @@ CONFIG_HYPERVISOR_GUEST=y
 CONFIG_PARAVIRT=y
 CONFIG_NR_CPUS=8
 CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
-CONFIG_MICROCODE_AMD=y
 CONFIG_X86_MSR=y
 CONFIG_X86_CPUID=y
 CONFIG_X86_CHECK_BIOS_CORRUPTION=y

arch/x86/configs/x86_64_defconfig

@@ -31,7 +31,6 @@ CONFIG_SMP=y
 CONFIG_HYPERVISOR_GUEST=y
 CONFIG_PARAVIRT=y
 CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
-CONFIG_MICROCODE_AMD=y
 CONFIG_X86_MSR=y
 CONFIG_X86_CPUID=y
 CONFIG_NUMA=y

arch/x86/kernel/cpu/microcode/internal.h

@@ -104,15 +104,15 @@ int save_microcode_in_initrd_amd(unsigned int family);
 void reload_ucode_amd(unsigned int cpu);
 struct microcode_ops *init_amd_microcode(void);
 void exit_amd_microcode(void);
-#else /* CONFIG_MICROCODE_AMD */
+#else /* CONFIG_CPU_SUP_AMD */
 static inline void load_ucode_amd_bsp(unsigned int family) { }
 static inline void load_ucode_amd_ap(unsigned int family) { }
 static inline void load_ucode_amd_early(unsigned int family) { }
 static inline int save_microcode_in_initrd_amd(unsigned int family) { return -EINVAL; }
 static inline void reload_ucode_amd(unsigned int cpu) { }
 static inline struct microcode_ops *init_amd_microcode(void) { return NULL; }
 static inline void exit_amd_microcode(void) { }
-#endif /* !CONFIG_MICROCODE_AMD */
+#endif /* !CONFIG_CPU_SUP_AMD */
 
 #ifdef CONFIG_CPU_SUP_INTEL
 void load_ucode_intel_bsp(void);