x86/boot/compressed: Remove unused header includes from kaslr.c

Nothing is using the linux/ namespace headers anymore. Remove them.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Link: https://lore.kernel.org/r/20241130122644.GAZ0sEhD3Bm_9ZAIuc@fat_crate.local