pdump: revert PCI device name conversion

pdump: revert PCI device name conversion

Earlier ethdev library created the device names in the
"bus:device.func" format hence pdump library implemented
its own conversion method for changing the user passed
device name format "domain:bus:device.func" to "bus:device.func"
for finding the port id using device name using ethdev library
calls. Now after ethdev and eal rework
http://dpdk.org/dev/patchwork/patch/15855/,
the device names are created in the format "domain:bus:device.func",
so pdump library conversion is not needed any more, hence removed
the corresponding code.

Signed-off-by: Reshma Pattan <reshma.pattan@intel.com>
Acked-by: Fan Zhang <roy.fan.zhang@intel.com>