#553: add _zicsr_zifencei to the SiFive template

Author: ilg-ul

plugins/org.eclipse.embedcdt.templates.sifive.ui/templates/sifive_exe_c_project/template.xml

@@ -2308,6 +2308,17 @@ and is available athttps://www.eclipse.org/legal/epl-2.0/
 						name="path"
 						value="" />
 				</element>
+				<element>
+					<simple
+						name="id"
+						value="ilg.gnumcueclipse.managedbuild.cross.riscv.option.target.isa.extensions" />
+					<simple
+						name="value"
+						value="_zicsr_zifencei" />
+					<simple
+						name="path"
+						value="" />
+				</element>
 				<element>
 					<simple
 						name="id"