fix(AM57X): repair pru toc tree entry

This file was renamed in the below commit.

Fixes: 9dec3bc (PRU: Add PRU Subsystem information, 2022-06-08)
Signed-off-by: Randolph Sapp <rs@ti.com>

Author: StaticRocket

configs/AM57X/AM57X_linux_toc.txt

@@ -80,7 +80,7 @@ linux/Foundational_Components/Tools/Development_Tools
 linux/Foundational_Components/Tools/Flash_Tools
 linux/Foundational_Components/Tools/Pin_Mux_Tools
 linux/Foundational_Components/Tools/Code_Composer_Studio
-linux/Foundational_Components_PRU-ICSS_PRU_ICSSG
+linux/Foundational_Components_PRU_Subsystem
 linux/Foundational_Components/PRU-ICSS-Linux-Drivers
 linux/Foundational_Components/PRU-ICSS/Linux_Drivers/RemoteProc
 linux/Foundational_Components/PRU-ICSS/Linux_Drivers/RPMsg