Remove SPN configurations for Japan

These configurations has been causing problems since Android 5.1:
A docomo SIM card is regarded as no service.
A Y!mobile SIM card is regarded as Softbank.

Change-Id: Iead54ef9eff1d4bf0d472eb588fcda000cb228ad
(cherry picked from commit d60d2fd669aa75b49f7dba6a141008e1d9ea414c)
diff --git a/prebuilt/common/etc/spn-conf.xml b/prebuilt/common/etc/spn-conf.xml
index 857f3eb..f7ecaa0 100644
--- a/prebuilt/common/etc/spn-conf.xml
+++ b/prebuilt/common/etc/spn-conf.xml
@@ -3,9 +3,6 @@
 <spnOverrides>
   <!-- Korea -->
   <spnOverride numeric="45005" spn_display_rule="SPN_RULE_SHOW_PLMN" />
-  <!-- Japan -->
-  <spnOverride numeric="44010" spn_display_rule="SPN_RULE_SHOW_PLMN" />
-  <spnOverride numeric="44020" spn="SoftBank" />
   <!-- Hong Kong -->
   <spnOverride numeric="45406" spn="SmarTone" />
   <spnOverride numeric="45412" spn="中國移動香港" />