board: eets: pdu001: Fix wrong default value in Kconfig

After importing linux v4.16-rc1 commit 2c37e08464a8 ("kconfig: Warn if
choice default is not in choice"), Kconfig complains:

scripts/kconfig/conf  --syncconfig Kconfig
board/eets/pdu001/Kconfig:22:warning:        \
  choice default symbol 'PDU001_RUN_LED_RED' \
  is not contained in the choice

This looks to be caused by a typo. Fix it.

Fixes: 85ab0452 ("arm: add support for PDU001")
Signed-off-by: Eugeniu Rosca <erosca@de.adit-jv.com>
Reviewed-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Reviewed-by: Felix Brack <fb@ltec.ch>
Tested-by: Felix Brack <fb@ltec.ch>