powerpc/85xx: Kconfig cleanup

Introduce new FSL_SOC_BOOKE Kconfig to handle both 85xx and QorIQ
based chips.

Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
diff --git a/arch/powerpc/sysdev/fsl_soc.c b/arch/powerpc/sysdev/fsl_soc.c
index adca4af..b91f7ac 100644
--- a/arch/powerpc/sysdev/fsl_soc.c
+++ b/arch/powerpc/sysdev/fsl_soc.c
@@ -372,7 +372,7 @@
 
 arch_initcall(fsl_usb_of_init);
 
-#if defined(CONFIG_PPC_85xx) || defined(CONFIG_PPC_86xx)
+#if defined(CONFIG_FSL_SOC_BOOKE) || defined(CONFIG_PPC_86xx)
 static __be32 __iomem *rstcr;
 
 static int __init setup_rstcr(void)