x86/microcode/AMD: Remove unused PATCH_MAX_SIZE macro

Orphaned after

  05e91e72 ("x86/microcode/AMD: Rip out static buffers")

No functional changes.
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>

arch/x86/kernel/cpu/microcode/amd.c

@@ -84,8 +84,6 @@ struct microcode_amd {
 	unsigned int			mpb[];
 };
 
-#define PATCH_MAX_SIZE (3 * PAGE_SIZE)
-
 static struct equiv_cpu_table {
 	unsigned int num_entries;
 	struct equiv_cpu_entry *entry;