You have a CPUID mask setting in /etc/vmware/config which disables virtualized VT-x. I assume this is because this host is part of an EVC cluster. If you remove the host from the EVC cluster, I expect that virtualized VT-x will work. Alternatively, you can change cpuidMask.val.1.ecx to:
cpuidMask.val.1.ecx = 0x0000a239
That should also do the trick, though I don't know how it will affect your EVC cluster.
