powerpc/mpc5200: Remove fsl-soc.c from mpc5200 build, it is not needed.

Signed-off-by: NJon Smirl <jonsmirl@gmail.com>
Signed-off-by: NGrant Likely <grant.likely@secretlab.ca>

arch/powerpc/platforms/52xx/Kconfig

 config PPC_MPC52xx
 	bool "52xx-based boards"
 	depends on PPC_MULTIPLATFORM && PPC32
-	select FSL_SOC
 	select PPC_CLOCK
 
 config PPC_MPC5200_SIMPLE