target/hppa: Adjust insn mask for mfctl,w

While the E bit is only used for pa2.0 mfctl,w from sar,
the otherwise reserved bit does not appear to be decoded.
Signed-off-by: NRichard Henderson <richard.henderson@linaro.org>

target/hppa/translate.c

@@ -2162,7 +2162,7 @@ static const DisasInsn table_system[] = {
     { 0x016018c0u, 0xffe0ffffu, trans_mtsarcm },
     { 0x000014a0u, 0xffffffe0u, trans_mfia },
     { 0x000004a0u, 0xffff1fe0u, trans_mfsp },
-    { 0x000008a0u, 0xfc1fffe0u, trans_mfctl },
+    { 0x000008a0u, 0xfc1fbfe0u, trans_mfctl },
     { 0x00000400u, 0xffffffffu, trans_sync },
     { 0x000010a0u, 0xfc1f3fe0u, trans_ldsid },
 #ifndef CONFIG_USER_ONLY