thunerx_88xx: Clean up config slightly.

We don't use CONFIG_SYS_64BIT anywhere and can use
CONFIG_TARGET_THUNDERX_88XX to build the device trees.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/arch/arm/dts/Makefile b/arch/arm/dts/Makefile
index 87b210d..8f7ecfd 100644
--- a/arch/arm/dts/Makefile
+++ b/arch/arm/dts/Makefile
@@ -414,7 +414,7 @@
 	am437x-cm-t43.dtb
 dtb-$(CONFIG_TARGET_AM3517_EVM) += am3517-evm.dtb
 dtb-$(CONFIG_TI816X) += dm8168-evm.dtb
-dtb-$(CONFIG_THUNDERX) += thunderx-88xx.dtb
+dtb-$(CONFIG_TARGET_THUNDERX_88XX) += thunderx-88xx.dtb
 
 dtb-$(CONFIG_ARCH_SOCFPGA) +=				\
 	socfpga_agilex_socdk.dtb			\
diff --git a/include/configs/thunderx_88xx.h b/include/configs/thunderx_88xx.h
index cc3891f..cf2efdb 100644
--- a/include/configs/thunderx_88xx.h
+++ b/include/configs/thunderx_88xx.h
@@ -6,10 +6,6 @@
 #ifndef __THUNDERX_88XX_H__
 #define __THUNDERX_88XX_H__
 
-#define CONFIG_THUNDERX
-
-#define CONFIG_SYS_64BIT
-
 #define MEM_BASE			0x00500000
 
 #define CONFIG_SYS_LOWMEM_BASE		MEM_BASE