hooks: Use the common power code to power off

Use the power method instead of hard-coding ykusb, so we can use this
script from multiple places.

Signed-off-by: Simon Glass <sjg@chromium.org>
Signed-off-by: Stephen Warren <swarren@wwwdotorg.org>

test/hooks/bin/flash.sdwire_poweroff_mount

@@ -18,7 +18,7 @@
 # FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
 # DEALINGS IN THE SOFTWARE.
 
-# Designed for using SDwire uSD myx and ykush USB power control:
+# Designed for using SDwire uSD mux and ykush USB power control:
 # https://wiki.tizen.org/SDWire
 # https://www.yepkit.com/products/ykush
 
@@ -27,6 +27,6 @@
 # ykushcmd at https://github.com/Yepkit/ykush
 
 # Power off
-ykushcmd -s ${ykush_serial} -d ${ykush_port}
+. poweroff.${power_impl}
 
 . flash.sdwire_common_mount

test/hooks/bin/flash.sdwire_poweroff_raw

@@ -29,7 +29,7 @@
 mount_dir=/media/${mount_point}
 
 # Power off
-ykushcmd -s ${ykush_serial} -d ${ykush_port}
+. poweroff.${power_impl}
 
 # Switch over to get USB card access
 sd-mux-ctrl --device-serial ${sdwire_serial} --ts

test/hooks/bin/kea/conf.Linksprite_pcDuino3_sjg-pcduino3

@@ -20,7 +20,7 @@
 
 console_dev=/dev/ttyusb_port2
 reset_impl=ykush
-flash_impl=sdwire_ykush_raw
+flash_impl=sdwire_poweroff_raw
 power_impl=ykush
 
 flash_writer=sunxi_raw

test/hooks/bin/kea/conf.rpi_3_32b_sjg-rpi_3b

@@ -20,7 +20,7 @@
 
 console_dev=/dev/ttyusb_port1
 reset_impl=ykush
-flash_impl=sdwire_ykush_mount
+flash_impl=sdwire_poweroff_mount
 power_impl=ykush
 
 flash_writer=rpi3_mount