xtensa: sample_controller32: for Xtensa MPU support

The overlay comes from:

  https://github.com/jcmvbkbc/xtensa-toolchain-build
    commit 435c5e8b108de520565886f3f2349cc6be3fe712
    under directory overlays/

This would allow us to use QEMU to test the Xtensa MPU code
on main Zephyr repo.

Signed-off-by: Daniel Leung <[email protected]>

Author: dcpleung

configs/xtensa-sample_controller32_zephyr-elf.config

@@ -0,0 +1,9 @@
+CT_CONFIG_VERSION="3"
+CT_EXPERIMENTAL=y
+CT_OVERLAY_LOCATION="overlays"
+CT_OVERLAY_NAME="sample_controller32"
+CT_ARCH_XTENSA=y
+CT_XTENSA_CUSTOM=y
+CT_TARGET_VENDOR="sample_controller32_zephyr"
+CT_TARGET_CFLAGS="-ftls-model=local-exec"
+CT_CC_GCC_CONFIG_TLS=n