powerpc/kconfig: Remove TSI108_BRIDGE duplicates

The MPC7448HPC2 and PPC_HOLLY config options contain TSI108_BRIDGE
duplicates since commit:

commit 3490cba5
Author: Jon Loeliger <jdl@jdl.com>
Date:   Wed Jan 23 12:42:50 2008 -0600

    [POWERPC] Add initial iomega StorCenter board port.

This patch cleans these duplicates.
Signed-off-by: NLuis Henriques <luis.henriques@canonical.com>
Signed-off-by: NScott Wood <scottwood@freescale.com>

arch/powerpc/platforms/embedded6xx/Kconfig

@@ -34,7 +34,6 @@ config MPC7448HPC2
 	select TSI108_BRIDGE
 	select DEFAULT_UIMAGE
 	select PPC_UDBG_16550
-	select TSI108_BRIDGE
 	help
 	  Select MPC7448HPC2 if configuring for Freescale MPC7448HPC2 (Taiga)
 	  platform
@@ -44,7 +43,6 @@ config PPC_HOLLY
 	depends on EMBEDDED6xx
 	select TSI108_BRIDGE
 	select PPC_UDBG_16550
-	select TSI108_BRIDGE
 	help
 	  Select PPC_HOLLY if configuring for an IBM 750GX/CL Eval
 	  Board with TSI108/9 bridge (Hickory/Holly)