rush: use generic spintable support

With the generic spintable support in place, use that.

BUG=chrome-os-partner:32082
BRANCH=None
TEST=None

Change-Id: Ic9949144ed1e9a952290d50b6726bf5891547896
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/218657
Reviewed-by: Furquan Shaikh <furquan@chromium.org>

src/mainboard/google/rush/Kconfig

@@ -31,6 +31,7 @@ config BOARD_SPECIFIC_OPTIONS # dummy
 	select SOC_NVIDIA_TEGRA132
 	select MAINBOARD_HAS_BOOTBLOCK_INIT
 	select VIRTUAL_DEV_SWITCH
+	select ARCH_SPINTABLE
 
 config MAINBOARD_DIR
         string

src/mainboard/google/rush/devicetree.cb

@@ -18,6 +18,8 @@
 ##
 
 chip soc/nvidia/tegra132
+	register  "spintable_addr" = "0x80000008"
+
 	device cpu_cluster 0 on
 		device cpu 0 on end
 		device cpu 1 on end