x86/alternatives: Fix section mismatch warnings

Fix stuff like:

  WARNING: modpost: vmlinux.o: section mismatch in reference: \
  __optimize_nops (section: .text) -> debug_alternative (section: .init.data)
Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20230513160146.16039-1-bp@alien8.de

arch/x86/kernel/alternative.c

@@ -193,8 +193,8 @@ static int skip_nops(u8 *instr, int offset, int len)
  * Optimize a sequence of NOPs, possibly preceded by an unconditional jump
  * to the end of the NOP sequence into a single NOP.
  */
-static bool __optimize_nops(u8 *instr, size_t len, struct insn *insn,
-			    int *next, int *prev, int *target)
+static bool __init_or_module
+__optimize_nops(u8 *instr, size_t len, struct insn *insn, int *next, int *prev, int *target)
 {
 	int i = *next - insn->length;
 
@@ -765,7 +765,7 @@ void __init_or_module noinline apply_returns(s32 *start, s32 *end) { }
 
 #ifdef CONFIG_X86_KERNEL_IBT
 
-static void poison_endbr(void *addr, bool warn)
+static void __init_or_module poison_endbr(void *addr, bool warn)
 {
 	u32 endbr, poison = gen_endbr_poison();