The path for the GPIO devices needs to be '\_SB', not '\SB'. Fix
the path so that it references the system bus.
BUG=b:72121803
Change-Id: I7c6c38ecea0f8f95ff52b3390f92c5b7e79bcd6d
Signed-off-by: Aaron Durbin <adurbin@chromium.org>
Reviewed-on: https://review.coreboot.org/23501
Reviewed-by: Justin TerAvest <teravest@chromium.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>