mediatek: remove erroneous pipe action from BE7200 recipe

mediatek: remove erroneous pipe action from BE7200 recipe

Remove the errorneous pipe action from the BE7200 device package list.

It causes visible errors into config:

 perus@ub2510:/OpenWrt/aarch64$ make defconfig
 ...
 tmp/.config-target.in:55023:warning: ignoring unsupported character '|'
 tmp/.config-target.in:191877:warning: ignoring unsupported character '|'
 tmp/.config-target.in:191878:warning: ignoring unsupported character '|'
 tmp/.config-target.in:285812:warning: ignoring unsupported character '|'
 tmp/.config-target.in:285815:warning: ignoring unsupported character '|'
 tmp/.config-target.in:285819:warning: ignoring unsupported character '|'
 tmp/.config-target.in:285820:warning: ignoring unsupported character '|'
 #
 # configuration written to .config
 #

 File tmp/.config-target.in:

  55020         select DEFAULT_urandom-seed
  55021         select DEFAULT_urngd
  55022         select DEFAULT_wpad-basic-mbedtls
  55023         select DEFAULT_|
  55024         help
  55025           Build firmware images for Routerich BE7200

Fixes: ff5e66a9208a ("mediatek: add support for Routerich BE7200")
Signed-off-by: Hannu Nyman <hannu.nyman@iki.fi>
Link: https://github.com/openwrt/openwrt/pull/21376
Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de>