x86/boot: Drop erroneous __init annotation from early_set_pages_state()

The kexec code will call set_pages_state() after tearing down all the GHCBs,
which will therefore result in a call to early_set_pages_state().

This means the __init annotation is wrong, and must be dropped.

Fixes: c5c30a373693 ("x86/boot: Move startup code out of __head section")
Reported-by: Srikanth Aithal <[e-mail]>
Signed-off-by: Ard Biesheuvel <[e-mail]>
Signed-off-by: Borislav Petkov (AMD) <[e-mail]>
Tested-by: Srikanth Aithal <[e-mail]>

arch/x86/boot/startup/sev-startup.c

···
 /* Include code shared with pre-decompression boot stage */
 #include "sev-shared.c"
 
-void __init
+void
 early_set_pages_state(unsigned long vaddr, unsigned long paddr,
 		      unsigned long npages, const struct psc_desc *desc)
 {