x86/cpufeature: Remove cpu_has_hypervisor

Use boot_cpu_has() instead.

Tested-by: David Kershner <david.kershner@unisys.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: sparmaintainer@unisys.com
Cc: virtualization@lists.linux-foundation.org
Link: http://lkml.kernel.org/r/1459266123-21878-3-git-send-email-bp@alien8.de


Signed-off-by: Ingo Molnar <mingo@kernel.org>