scx: Move tools/sched_ext/Kconfig content into sched-ext.rst

Kconfig files are usually used to describe config options and tools/sched_ext/Kconfig isn't being referenced from anywhere. Let's move its content into the documentation.
sched-ext · Feb 28, 2024 · 27b5de2 · 27b5de2
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diff --git a/Documentation/scheduler/sched-ext.rst b/Documentation/scheduler/sched-ext.rst
@@ -22,7 +22,20 @@ Switching to and from sched_ext
 ===============================
 
 ``CONFIG_SCHED_CLASS_EXT`` is the config option to enable sched_ext and
-``tools/sched_ext`` contains the example schedulers.
+``tools/sched_ext`` contains the example schedulers. The following config
+options should be enabled to use sched_ext:
+
+.. code-block:: none
+
+    CONFIG_BPF=y
+    CONFIG_SCHED_CLASS_EXT=y
+    CONFIG_BPF_SYSCALL=y
+    CONFIG_BPF_JIT=y
+    CONFIG_DEBUG_INFO_BTF=y
+    CONFIG_BPF_JIT_ALWAYS_ON=y
+    CONFIG_BPF_JIT_DEFAULT_ON=y
+    CONFIG_PAHOLE_HAS_SPLIT_BTF=y
+    CONFIG_PAHOLE_HAS_BTF_TAG=y
 
 sched_ext is used only when the BPF scheduler is loaded and running.
 

diff --git a/tools/sched_ext/Kconfig b/tools/sched_ext/Kconfig