Pull x86 build updates from Ingo Molnar:

 - Use -fpic to build the kexec 'purgatory' (the self-contained
   code that runs between two kernels)

 - Clean up vmlinux.lds.S generation

 - Simplify the X86_EXTENDED_PLATFORM section of the x86 Kconfig

 - Misc cleanups & fixes

* tag 'x86-build-2024-05-13' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/Kconfig: Merge the two CONFIG_X86_EXTENDED_PLATFORM entries
  x86/purgatory: Switch to the position-independent small code model
  x86/boot: Replace __PHYSICAL_START with LOAD_PHYSICAL_ADDR
  x86/vmlinux.lds.S: Take __START_KERNEL out conditional definition
  x86/vmlinux.lds.S: Remove conditional definition of LOAD_OFFSET
  vmlinux.lds.h: Fix a typo in comment