Add system/iot/attestation

Add system/iot/attestation to the "pdk" group
Bug: 62379809
Test: repo sync checks out the code, unittests build and pass
Change-Id: If8e8da2e8dd0c561dd5e842e957f13da0b9bd5b1

default.xml

@@ -566,6 +566,7 @@
   <project path="system/gatekeeper" name="platform/system/gatekeeper" groups="pdk" />
   <project path="system/hardware/interfaces" name="platform/system/hardware/interfaces" groups="pdk" />
   <project path="system/hwservicemanager" name="platform/system/hwservicemanager" groups="pdk" />
+  <project path="system/iot/attestation" name="platform/system/iot/attestation" groups="pdk" />
   <project path="system/keymaster" name="platform/system/keymaster" groups="pdk" />
   <project path="system/libfmq" name="platform/system/libfmq" />
   <project path="system/libhidl" name="platform/system/libhidl" />