Create GPU shutdown error

Will be used on Witherspoon when the GPUs report an overtemp
to the power sequencer chip.  The failing GPU will be called
out in a separate overtemp error log, and then this shutdown
error will be created when code powers off the system to
protect the chip.

Change-Id: I55b836f469f0fc035386130a16b433a5eba96a8b
Signed-off-by: Matt Spinler <spinler@us.ibm.com>
diff --git a/xyz/openbmc_project/State/Shutdown/ThermalEvent.errors.yaml b/xyz/openbmc_project/State/Shutdown/ThermalEvent.errors.yaml
index f00b702..b711247 100644
--- a/xyz/openbmc_project/State/Shutdown/ThermalEvent.errors.yaml
+++ b/xyz/openbmc_project/State/Shutdown/ThermalEvent.errors.yaml
@@ -1,2 +1,5 @@
 - name: Processor
   description: The system shut down due to processor overtemp.
+
+- name: GPU
+  description: The system shut down due to a GPU overtemp.