fix(coresdk): purge coresdk build target and files

Purge coresdk related build target and files as this is no longer
maintained and is just selecting the same conditional material as
AM335X.

Signed-off-by: Randolph Sapp <[email protected]>

Author: StaticRocket

README.md

@@ -47,7 +47,6 @@ of directories listed under `configs/`. For example:
  * "J784S4" (representing Jacinto 7 AHP)
  * "J722S" (representing Jacinto 7 AEN)
  * "GEN" (representing General family not listed above)
- * "CORESDK" (representing CORESDK)
 
 OS represents the operating system. Possible values correspond to the second
 parameter of files listed under the `configs/<DEVFAMILY>/` directory. For

configs/CORESDK/CORESDK_linux_config.txt

@@ -5,12 +5,8 @@ Release Specific
 .. toctree::
    :maxdepth: 5
 
-   Release_Specific_CoreSDK_Release_Notes
    Release_Specific_PLSDK_Release_Notes
-   Release_Specific_CoreSDK_Performance_Guide
    Release_Specific_Performance_Guide
-   Release_Specific_CoreSDK_Yocto_layer_Configuration
    Release_Specific_Yocto_layer_Configuration
-   Release_Specific_CoreSDK_Migration_Guide
    Release_Specific_Migration_Guide
    Release_Specific_Supported_Platforms_and_Versions