Fix kernel_HdParm for Rambi machines

Use modern way for finding the fixed devices.

TEST=On squawks and falco
BUG=chromium:374040

Change-Id: Ie89a0858178406c5a48619956e408ca0235b9b77
Reviewed-on: https://chromium-review.googlesource.com/204994
Reviewed-by: Puthikorn Voravootivat <puthik@chromium.org>
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
Tested-by: Gwendal Grignou <gwendal@chromium.org>
Commit-Queue: Gwendal Grignou <gwendal@chromium.org>
1 file changed