slimbus: core: rearrange slim_eaddr structure

Rearrange struct slim_eaddr so that the structure is packed correctly
to be able to send in SLIMBus messages.

Signed-off-by: Srinivas Kandagatla <srinivas.kandagatla@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>