eth: switch: added support for switch E6176

	- This patch added support for switch E6176
	  the switch run with the same init function of E6171 swicth
	- Added to switch struct indication of cpu port connectivity:
	  isCpuPortRgmii: to set if the switch is connected to RGMII-phy

	** tested on devel branch on A395-RD board **

Change-Id: Ie22dc1a94ef73e6f912698115275559a5ac2506e
Signed-off-by: Hanna Hawa <hannah@marvell.com>
Reviewed-on: http://vgitil04.il.marvell.com:8080/19191
Tested-by: Star_Automation <star@marvell.com>
Reviewed-by: Omri Itach <omrii@marvell.com>
(cherry picked from commit 466cc4cf9ed1246e34921aa552a2bf623fdbdb9b)
Reviewed-on: http://vgitil04.il.marvell.com:8080/19235
8 files changed