net: phy: ti: rename ti.c to dp83867.c

The driver ti.c is actually driver for TI DP83867x PHYs, so rename it
accordingly.

Signed-off-by: Grygorii Strashko <grygorii.strashko@ti.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
diff --git a/drivers/net/phy/Makefile b/drivers/net/phy/Makefile
index 76b6197..78955c5 100644
--- a/drivers/net/phy/Makefile
+++ b/drivers/net/phy/Makefile
@@ -25,7 +25,7 @@
 obj-$(CONFIG_PHY_REALTEK) += realtek.o
 obj-$(CONFIG_PHY_SMSC) += smsc.o
 obj-$(CONFIG_PHY_TERANETICS) += teranetics.o
-obj-$(CONFIG_PHY_TI) += ti.o
+obj-$(CONFIG_PHY_TI) += dp83867.o
 obj-$(CONFIG_PHY_XILINX) += xilinx_phy.o
 obj-$(CONFIG_PHY_XILINX_GMII2RGMII) += xilinx_gmii2rgmii.o
 obj-$(CONFIG_PHY_VITESSE) += vitesse.o
diff --git a/drivers/net/phy/ti.c b/drivers/net/phy/dp83867.c
similarity index 100%
rename from drivers/net/phy/ti.c
rename to drivers/net/phy/dp83867.c