KVM: x86/mmu: Delete the "dbg" module param

Delete KVM's "dbg" module param now that its usage in KVM is gone (it
used to guard pgprintk() and rmap_printk()).

Link: https://lore.kernel.org/r/20230729004722.1056172-4-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

arch/x86/kvm/mmu/mmu.c

@@ -115,11 +115,6 @@ static int max_huge_page_level __read_mostly;
 static int tdp_root_level __read_mostly;
 static int max_tdp_level __read_mostly;
 
-#ifdef MMU_DEBUG
-bool dbg = 0;
-module_param(dbg, bool, 0644);
-#endif
-
 #define PTE_PREFETCH_NUM		8
 
 #include <trace/events/kvm.h>

arch/x86/kvm/mmu/mmu_internal.h

@@ -9,8 +9,6 @@
 #undef MMU_DEBUG
 
 #ifdef MMU_DEBUG
-extern bool dbg;
-
 #define MMU_WARN_ON(x) WARN_ON(x)
 #else
 #define MMU_WARN_ON(x) do { } while (0)