KVM: VMX: Bundle all L1 data cache flush mitigation code together

Move vmx_l1d_flush(), vmx_cleanup_l1d_flush(), and the vmentry_l1d_flush
param code up in vmx.c so that all of the L1 data cache flushing code is
bundled together.  This will allow conditioning the mitigation code on
CONFIG_CPU_MITIGATIONS=y with minimal #ifdefs.

No functional change intended.

Reviewed-by: Brendan Jackman <jackmanb@google.com>
Reviewed-by: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>
Link: https://patch.msgid.link/20251113233746.1703361-8-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>

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