x86/kvm: Always inline to_svm()

vmlinux.o: warning: objtool: svm_vcpu_enter_exit()+0x13: call to to_svm() leaves .noinstr.text section

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://lore.kernel.org/r/20210624095148.066347165@infradead.org