Move the bit defines for MSR_IA32_VMX_BASIC from msr-index.h to vmx.h so
that they are colocated with other VMX MSR bit defines, and with the
helpers that extract specific information from an MSR_IA32_VMX_BASIC value.

Opportunistically use BIT_ULL() instead of open coding hex values.

Opportunistically rename VMX_BASIC_64 to VMX_BASIC_32BIT_PHYS_ADDR_ONLY,
as "VMX_BASIC_64" is widly misleading.  The flag enumerates that addresses
are limited to 32 bits, not that 64-bit addresses are allowed.

Last but not least, opportunistically #define DUAL_MONITOR_TREATMENT so
that all known single-bit feature flags are defined (this will allow
replacing open-coded literals in the future).

Cc: Shan Kang <shan.kang@intel.com>
Cc: Kai Huang <kai.huang@intel.com>
Signed-off-by: Xin Li <xin3.li@intel.com>
[sean: split to separate patch, write changelog]
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Reviewed-by: Kai Huang <kai.huang@intel.com>
Reviewed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20240605231918.2915961-5-seanjc@google.comSigned-off-by: Sean Christopherson <seanjc@google.com>