Drop redundant CHIP_NAME in mainboard.c

Compose the name from Kconfig strings instead.

As the field is for debug print use only, a minor change in the output
should do no harm. The strings no longer include word "Mainboard".

Change-Id: Ifd24f408271eb5a5d1a08a317512ef00cb537ee2
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/1635
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>

src/mainboard/ibm/e325/mainboard.c

@@ -1,6 +1,5 @@
 #include <device/device.h>
 
 struct chip_operations mainboard_ops = {
-	CHIP_NAME("IBM eServer 325 Mainboard")
 };
 

src/mainboard/ibm/e326/mainboard.c

@@ -1,6 +1,5 @@
 #include <device/device.h>
 
 struct chip_operations mainboard_ops = {
-	CHIP_NAME("IBM eServer 326 Mainboard")
 };