x86/fpu: Remove unnecessary CPUID level check

The CPUID level dependency table will entirely zap X86_FEATURE_XSAVE
if the CPUID level is too low.  This code is unreachable.  Kill it.

Signed-off-by: Dave Hansen <[email protected]>
Reviewed-by: Chang S. Bae <[email protected]>
Link: https://lore.kernel.org/all/20241213205038.6E71F9A4%40davehans-spike.ostc.intel.com

Author: hansendc

arch/x86/kernel/fpu/xstate.c

@@ -764,11 +764,6 @@ void __init fpu__init_system_xstate(unsigned int legacy_size)
 		return;
 	}
 
-	if (boot_cpu_data.cpuid_level < XSTATE_CPUID) {
-		WARN_ON_FPU(1);
-		return;
-	}
-
 	/*
 	 * Find user xstates supported by the processor.
 	 */