ti_config_fragments/connectivity.cfg: Enable PRU Ethernet driver

Add the configuration to build the PRU Ethernet driver as a
module to support the PRU Ethernet ports available on various
AMxxxx IDK boards.

Signed-off-by: Roger Quadros <rogerq@ti.com>
Signed-off-by: Suman Anna <s-anna@ti.com>
Signed-off-by: Andrew F. Davis <afd@ti.com>
Signed-off-by: Sekhar Nori <nsekhar@ti.com>

ti_config_fragments/connectivity.cfg

@@ -35,6 +35,7 @@ CONFIG_TI_CPSW_PHY_SEL=y
 CONFIG_TI_CPSW_ALE=y
 CONFIG_TI_CPSW=y
 CONFIG_TI_CPTS=y
+CONFIG_TI_PRUETH=m
 # non-TI Net vendors
 CONFIG_NET_DSA_BCM_SF2=n
 CONFIG_B53=n