Revert "x86/boot: Mark prepare_command_line() __init"

This reverts commit c0f2077b.
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20211213112757.2612-2-bp@alien8.de

arch/x86/kernel/setup.c

@@ -742,7 +742,7 @@ dump_kernel_offset(struct notifier_block *self, unsigned long v, void *p)
 	return 0;
 }
 
-static char * __init prepare_command_line(void)
+static char *prepare_command_line(void)
 {
 #ifdef CONFIG_CMDLINE_BOOL
 #ifdef CONFIG_CMDLINE_OVERRIDE