kdump: T8868: Enable crash dump and debug info in kernel configs

Enabling the following options allows us to use `kdump-tools`:
  - `CONFIG_CRASH_DUMP`
  - `CONFIG_DEBUG_INFO`
  - `CONFIG_PROC_VMCORE`

Author: alexandr-san4ez

scripts/package-build/linux-kernel/config/90-debug.config

@@ -180,3 +180,10 @@ CONFIG_IO_STRICT_DEVMEM=y
 # CONFIG_KCOV is not set
 # CONFIG_RUNTIME_TESTING_MENU is not set
 # CONFIG_MEMTEST is not set
+
+#
+# Kdump tool support
+#
+CONFIG_CRASH_DUMP=y
+CONFIG_DEBUG_INFO=y
+CONFIG_PROC_VMCORE=y