x86/kexec: remove unnecessary arch_kexec_kernel_image_load()

x86/kexec: remove unnecessary arch_kexec_kernel_image_load()

Patch series "kexec: Remove unnecessary arch hook", v2.

There are no arch-specific things in arch_kexec_kernel_image_load(), so
remove it and just use the generic version.

This patch (of 2):

The x86 implementation of arch_kexec_kernel_image_load() is functionally
identical to the generic arch_kexec_kernel_image_load():

  arch_kexec_kernel_image_load                # x86
    if (!image->fops || !image->fops->load)
      return ERR_PTR(-ENOEXEC);
    return image->fops->load(image, image->kernel_buf, ...)

  arch_kexec_kernel_image_load                # generic
    kexec_image_load_default
      if (!image->fops || !image->fops->load)
	return ERR_PTR(-ENOEXEC);
      return image->fops->load(image, image->kernel_buf, ...)

Remove the x86-specific version and use the generic
arch_kexec_kernel_image_load().  No functional change intended.

Link: https://lkml.kernel.org/r/20230307224416.907040-1-helgaas@kernel.org
Link: https://lkml.kernel.org/r/20230307224416.907040-2-helgaas@kernel.org
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Acked-by: Baoquan He <bhe@redhat.com>
Cc: Borislav Petkov (AMD) <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>