rockchip: remove redundant CONFIG_SYS_NS16550_MEM32

The CONFIG_SYS_NS16550_MEM32 already defined in
rockchip_common.h, no need to define again in soc
level header.

Signed-off-by: Kever Yang <kever.yang@rock-chips.com>
diff --git a/include/configs/rk3188_common.h b/include/configs/rk3188_common.h
index 1d41702..ec90088 100644
--- a/include/configs/rk3188_common.h
+++ b/include/configs/rk3188_common.h
@@ -15,8 +15,6 @@
 #define CONFIG_SYS_MALLOC_LEN		(32 << 20)
 #define CONFIG_SYS_CBSIZE		1024
 
-#define CONFIG_SYS_NS16550_MEM32
-
 #ifdef CONFIG_SPL_ROCKCHIP_BACK_TO_BROM
 /* Bootrom will load u-boot binary to 0x60000000 once return from SPL */
 #endif
diff --git a/include/configs/rk3328_common.h b/include/configs/rk3328_common.h
index 2a81c80..3a8e37e 100644
--- a/include/configs/rk3328_common.h
+++ b/include/configs/rk3328_common.h
@@ -12,8 +12,6 @@
 #define CONFIG_SYS_CBSIZE		1024
 #define CONFIG_SKIP_LOWLEVEL_INIT
 
-#define CONFIG_SYS_NS16550_MEM32
-
 #define CONFIG_SYS_INIT_SP_ADDR		0x00300000
 #define CONFIG_SYS_LOAD_ADDR		0x00800800
 #define CONFIG_SPL_STACK		0x00400000
diff --git a/include/configs/rk3368_common.h b/include/configs/rk3368_common.h
index 8a1e311..1a859a7 100644
--- a/include/configs/rk3368_common.h
+++ b/include/configs/rk3368_common.h
@@ -23,8 +23,6 @@
 #define CONFIG_ROCKCHIP_STIMER_BASE	0xff830020
 #define COUNTER_FREQUENCY		24000000
 
-#define CONFIG_SYS_NS16550_MEM32
-
 #define CONFIG_SYS_INIT_SP_ADDR		0x00300000
 #define CONFIG_SYS_LOAD_ADDR		0x00280000
 
diff --git a/include/configs/rk3399_common.h b/include/configs/rk3399_common.h
index 8df0180..63eac19 100644
--- a/include/configs/rk3399_common.h
+++ b/include/configs/rk3399_common.h
@@ -15,8 +15,6 @@
 #define COUNTER_FREQUENCY               24000000
 #define CONFIG_ROCKCHIP_STIMER_BASE	0xff8680a0
 
-#define CONFIG_SYS_NS16550_MEM32
-
 #define CONFIG_SYS_INIT_SP_ADDR		0x00300000
 #define CONFIG_SYS_LOAD_ADDR		0x00800800