Add 'greater than' support in depex computation.

Added support in code to compute depex expressions
with _GE_ and _GTE_.

Tested:
With bios.xml file which had the following knob:

<knob
type="scalar"
setupType="numeric"
name="CoreDisableMask_0"
varstoreIndex="05"
prompt="CoreDisableMask_0"
description="Core Disable Bitmap (Hex)  0:
    Enable all cores. 0xffff: Disable all cores  "
size="8"
offset="0x014A"
depex="Sif( SstPpLevelTotalCount _GT_ 1
    AND ( ( IssTdpLevel _EQU_ 0xFF
	AND SstPpLevelEnableSystem_0 _NEQ_ 1 )
	OR ( IssTdpLevel _NEQ_ 0xFF AND IssTdpLevel _GT_ 0 )
	OR DynamicIss _EQU_ 1 ) )"
default="0x0000000000000000"
CurrentVal="0x0000000000000000"
min="0x0"
max="0xFFFFFFFFFFFFFFFF"
step="0x1"/>

Signed-off-by: Arun Lal K M <arun.lal@intel.com>
Change-Id: I45cd879ca1bb35e6cde9ea581b3a5c63577525d0
diff --git a/include/biosxml.hpp b/include/biosxml.hpp
index 4e41e61..573115d 100644
--- a/include/biosxml.hpp
+++ b/include/biosxml.hpp
@@ -62,6 +62,8 @@
     unknown = 0,

     OR,

     AND,

+    GT,

+    GTE,

     LTE,

     LT,

     EQU,

@@ -433,6 +435,26 @@
                     values.emplace(0);

                     break;

 

+                case knob::DepexOperators::GTE:

+                    if (a >= b)

+                    {

+                        values.emplace(1);

+                        break;

+                    }

+

+                    values.emplace(0);

+                    break;

+

+                case knob::DepexOperators::GT:

+                    if (a > b)

+                    {

+                        values.emplace(1);

+                        break;

+                    }

+

+                    values.emplace(0);

+                    break;

+

                 case knob::DepexOperators::MODULO:

                     if (b == 0)

                     {

@@ -539,6 +561,14 @@
                 {

                     operators.emplace(knob::DepexOperators::LT);

                 }

+                else if (word == "_GTE_")

+                {

+                    operators.emplace(knob::DepexOperators::GTE);

+                }

+                else if (word == "_GT_")

+                {

+                    operators.emplace(knob::DepexOperators::GT);

+                }

                 else if (word == "_NEQ_")

                 {

                     operators.emplace(knob::DepexOperators::NEQ);