KVM: VMX: Rename vmx_get_max_tdp_level() to vmx_get_max_ept_level()

In VMX, ept_level looks better than tdp_level and is consistent with
SVM's get_npt_level().

Signed-off-by: Shiyuan Gao <gaoshiyuan@baidu.com>
Link: https://lore.kernel.org/r/20230810113853.98114-1-gaoshiyuan@baidu.com


[sean: massage changelog]
Signed-off-by: Sean Christopherson <seanjc@google.com>