ANDROID: pkvm: vmx: Only intercept MC exception for the protected VM by default

For the protected VM, only intercept the machine check exception and
passthrough the #PF/#UD/#DB/#AC by default to simplify the exception
vmexit handling.

Bug: 391539939
Test: pKVM works
Upstream-Task: 402758258

Change-Id: I514a811b660921ef20184f8c8bc5589d0f61194b
Signed-off-by: Chuanxiao Dong <chuanxiao.dong@intel.com>
Signed-off-by: Dmytro Maluka <dmaluka@google.com>