ARM: dts: am5729-beaglebone-ai: Disable ununsed mailboxes

The IPU and DSP remote processors use sub-mailbox nodes only from a
limited set of System Mailboxes 5 and 6 to achieve the Remote Processor
Messaging (RPMsg) communication stack between the MPU host processor
and the respective remote processor. These are all defined and enabled
through the inherited common dra74-ipu-dsp-common.dtsi file.

The other System Mailboxes do not define any actual sub-mailboxes, so
they serve no purpose and can all be safely dropped.
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>

arch/arm/boot/dts/am5729-beagleboneai.dts

@@ -630,58 +630,6 @@ &bandgap {
 	status = "okay";
 };
 
-&mailbox1 {
-	status = "okay";
-};
-
-&mailbox2 {
-	status = "okay";
-};
-
-&mailbox3 {
-	status = "okay";
-};
-
-&mailbox4 {
-	status = "okay";
-};
-
-&mailbox5 {
-	status = "okay";
-};
-
-&mailbox6 {
-	status = "okay";
-};
-
-&mailbox7 {
-	status = "okay";
-};
-
-&mailbox8 {
-	status = "okay";
-};
-
-&mailbox9 {
-	status = "okay";
-};
-
-&mailbox10 {
-	status = "okay";
-};
-
-&mailbox11 {
-	status = "okay";
-};
-
-&mailbox12 {
-	status = "okay";
-};
-
-&mailbox13 {
-	status = "okay";
-};
-
 &cpu_alert0 {
 	temperature = <55000>; /* milliCelsius */
 };