arm64: dts: hi3660: Fixed unused mailbox errors

Fixed bug reported by John Stultz
https://bugs.96boards.org/show_bug.cgi?id=658
When booting with the android-hikey-linaro-4.9 in AOSP,
I'm seeing a lot of hisi_mailbox errors:

Signed-off-by: Niranjan Yadla <nyadla@cadence.com>
diff --git a/arch/arm64/boot/dts/hisilicon/hisi_3660_ipc.dtsi b/arch/arm64/boot/dts/hisilicon/hisi_3660_ipc.dtsi
index 1f4d3d1..c5e2c551 100644
--- a/arch/arm64/boot/dts/hisilicon/hisi_3660_ipc.dtsi
+++ b/arch/arm64/boot/dts/hisilicon/hisi_3660_ipc.dtsi
@@ -205,15 +205,6 @@
 			used = <0>;
 			timeout = <300>;
 		};
-		mailbox-10 {
-			compatible = "HiIPCV230,tx-mailbox-fast";
-			func = <1 1 0>;
-			src_bit = <0>;
-			des_bit = <2>;
-			index = <10>;
-			used = <1>;
-			timeout = <300>;
-		};
 
 		mailbox-11 {
 			compatible = "HiIPCV230,tx-mailbox-fast";
@@ -235,19 +226,6 @@
 			timeout = <300>;
 		};
 
-		mailbox-13 {
-			compatible = "HiIPCV230,tx-mailbox-fast";
-			func = <1 1 0>;
-			src_bit = <0>;
-			des_bit = <3>;
-			index = <13>;
-			used = <1>;
-			timeout = <300>;
-			fifo_size = <8>;
-			sched_priority = <1>;
-			sched_policy = <1>;
-		};
-
 		mailbox-14 {
 			compatible = "HiIPCV230,tx-mailbox-fast";
 			func = <1 1 0>;
@@ -268,16 +246,6 @@
 			timeout = <300>;
 		};
 
-		mailbox-16 {
-			compatible = "HiIPCV230,tx-mailbox-fast";
-			func = <1 1 0>;
-			src_bit = <0>;
-			des_bit = <3>;
-			index = <16>;
-			used = <1>;
-			timeout = <300>;
-		};
-
 		mailbox-17 {
 			compatible = "HiIPCV230,tx-mailbox-fast";
 			func = <1 1 0>;
@@ -355,15 +323,6 @@
 			used = <0>;
 			timeout = <300>;
 		};
-		mailbox-25 {
-			compatible = "HiIPCV230,tx-mailbox-fast";
-			func = <1 1 0>;
-			src_bit = <0>;
-			des_bit = <7>;
-			index = <25>;
-			used = <1>;
-			timeout = <300>;
-		};
 
 		mailbox-26 {
 			compatible = "HiIPCV230,tx-mailbox-fast";
@@ -375,39 +334,6 @@
 			timeout = <300>;
 		};
 
-		mailbox-27 {
-			compatible = "HiIPCV230,tx-mailbox-fast";
-			func = <1 1 0>;
-			src_bit = <0>;
-			des_bit = <3>;
-			index = <27>;
-			used = <1>;
-			timeout = <300>;
-		};
-
-		mailbox-28 {
-			compatible = "HiIPCV230,tx-mailbox-fast";
-			func = <1 1 0>;
-			src_bit = <0>;
-			des_bit = <3>;
-			index = <28>;
-			used = <1>;
-			timeout = <300>;
-		};
-		/* The mailbox-29 and mailbox-30  is comm-mailbox in SOC,
-		 * but fast-mailbox in software, define the src and des here,
-		 * if need use, add it below
-		 */
-		mailbox-29 {
-			compatible = "HiIPCV230,mailbox-comm";
-			func = <1 1 0>;
-			src_bit = <0>;
-			des_bit = <4>;
-			index = <29>;
-			used = <1>;
-			timeout = <300>;
-		};
-
 		mailbox-30 {
 			compatible = "HiIPCV230,mailbox-comm";
 			func = <1 1 0>;