fix(boot_monitor): remove deprecated boot utility

This old example has not been maintained and the u-boot commands
referenced in it's documentation do not seem to exist anymore.

Signed-off-by: Randolph Sapp <rs@ti.com>

Author: StaticRocket

configs/AM57X/AM57X_linux_toc.txt

@@ -44,7 +44,6 @@ linux/Foundational_Components/U-Boot/Applications
 linux/Foundational_Components/U-Boot/Apps-SPL-Debug-OpenOCD
 linux/Foundational_Components/U-Boot/Apps-Load-in-CCS
 linux/Foundational_Components/U-Boot/Apps-TroubleShooting
-linux/Foundational_Components_Boot_Monitor
 linux/Foundational_Components_Kernel
 linux/Foundational_Components_Kernel_Drivers
 linux/Foundational_Components/Kernel/Kernel_Drivers/ADC

source/images/Boot-kernel-arch.jpg

@@ -8,7 +8,6 @@ Foundational Components
    :maxdepth: 5
 
    Foundational_Components_U-Boot
-   Foundational_Components_Boot_Monitor
    Foundational_Components_Kernel
    Foundational_Components_Power_Management
    Foundational_Components_Security