model/css-rdn1edgex2.sh: strip warehouse path for RD_N1_E1_cmn600_ccix.yml

There is no need to set full path of RD_N1_E1_cmn600_ccix.yml file
because it resides in the same place as model's binary, so setting a
relative path is enough. This change also allows to pick the yaml file
correctly by FVP rdn1edgex2 models launched at [1].

[1] https://tf.validation.linaro.org/

Signed-off-by: Leonardo Sandoval <leonardo.sandoval@linaro.org>
Change-Id: Ic13c2e9f64cfbdb47e298022fc4e4834419dae6b
1 file changed