arm64: dts: ti: am65/j721e/j7200: Mark firmware used uart as "reserved"

Follow the device tree standards that states to set the
status="reserved" if an device is operational, but used by a non-linux
firmware in the system.
Signed-off-by: Nishanth Menon <nm@ti.com>
Reviewed-by: Tony Lindgren <tony@atomide.com>
Acked-by: Vignesh Raghavendra <vigneshr@ti.com>
Link: https://lore.kernel.org/r/20201113211826.13087-6-nm@ti.com

arch/arm64/boot/dts/ti/k3-am654-base-board.dts

@@ -242,7 +242,7 @@ AM65X_IOPAD(0x0010, PIN_INPUT, 0) /* (D21) ECAP0_IN_APWM_OUT */
 
 &wkup_uart0 {
 	/* Wakeup UART is used by System firmware */
-	status = "disabled";
+	status = "reserved";
 };
 
 &main_uart0 {

arch/arm64/boot/dts/ti/k3-j7200-common-proc-board.dts

@@ -79,7 +79,7 @@ J721E_IOPAD(0x120, PIN_OUTPUT, 0) /* (T4) USB0_DRVVBUS */
 
 &wkup_uart0 {
 	/* Wakeup UART is used by System firmware */
-	status = "disabled";
+	status = "reserved";
 };
 
 &main_uart0 {
@@ -89,7 +89,7 @@ &main_uart0 {
 
 &main_uart2 {
 	/* MAIN UART 2 is used by R5F firmware */
-	status = "disabled";
+	status = "reserved";
 };
 
 &main_uart3 {

arch/arm64/boot/dts/ti/k3-j721e-common-proc-board.dts

@@ -221,7 +221,7 @@ J721E_WKUP_IOPAD(0x0088, PIN_INPUT, 0) /* MCU_MDIO0_MDIO */
 
 &wkup_uart0 {
 	/* Wakeup UART is used by System firmware */
-	status = "disabled";
+	status = "reserved";
 };
 
 &main_uart0 {