mesa/es: Remove redundant separate stencil face validation

Signed-off-by: Ian Romanick <ian.d.romanick@intel.com>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>
Reviewed-by: Brian Paul <brianp@vmware.com>

src/mesa/main/APIspec.xml

@@ -953,12 +953,6 @@
 		<param name="ref" type="GLint"/>
 		<param name="mask" type="GLuint"/>
 	</proto>
-
-	<desc name="face">
-		<value name="GL_FRONT"/>
-		<value name="GL_BACK"/>
-		<value name="GL_FRONT_AND_BACK"/>
-	</desc>
 </template>
 
 <template name="StencilOp">
@@ -1018,12 +1012,6 @@
 		<param name="zpass" type="GLenum"/>
 	</proto>
 
-	<desc name="face">
-		<value name="GL_FRONT"/>
-		<value name="GL_BACK"/>
-		<value name="GL_FRONT_AND_BACK"/>
-	</desc>
-
 	<desc name="fail">
 		<value name="GL_KEEP"/>
 		<value name="GL_ZERO"/>