net: cpsw: make TI_CPSW_PHY_SEL invisible

TI_CPSW_PHY_SEL depended on TI_CPSW and was selected by the latter. So
there is no reason to have this symbol visible.

A further optimisation would be to put the code for both symbols into a
single module which would allow to not export at least cpsw_phy_sel()
and simplify the module load process.

Signed-off-by: Uwe Kleine-König <[e-mail]>
Signed-off-by: David S. Miller <[e-mail]>

drivers/net/ethernet/ti/Kconfig

···
 	  will be called davinci_cpdma.  This is recommended.
 
 config TI_CPSW_PHY_SEL
-	bool "TI CPSW Switch Phy sel Support"
-	depends on TI_CPSW
+	bool
 	---help---
 	  This driver supports configuring of the phy mode connected to
 	  the CPSW.