soc/mediatek: Remove duplicate enum declaration

Remove dram_cbt_mode in dramc_soc.h.

TEST=emerge-asurada coreboot

Signed-off-by: Rex-BC Chen <rex-bc.chen@mediatek.com>
Change-Id: Idc4a3887c9cc3f77cbdd7282e2977f6df858817d
Reviewed-on: https://review.coreboot.org/c/coreboot/+/54209
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Yu-Ping Wu <yupingso@google.com>
Reviewed-by: Xi Chen <xixi.chen@mediatek.com>

src/soc/mediatek/common/include/soc/dramc_param.h

@@ -129,7 +129,7 @@ struct ddr_base_info {
 	u32 support_ranks;
 	u64 rank_size[RANK_MAX];
 	struct emi_mdl emi_config;
-	dram_cbt_mode cbt_mode[RANK_MAX];
+	DRAM_CBT_MODE_T cbt_mode[RANK_MAX];
 };
 
 struct dramc_data {

src/soc/mediatek/mt8192/include/soc/dramc_soc.h

@@ -36,7 +36,7 @@ typedef enum {
 typedef enum {
 	CBT_NORMAL_MODE = 0,
 	CBT_BYTE_MODE1
-} DRAM_CBT_MODE_T, dram_cbt_mode;
+} DRAM_CBT_MODE_T;
 
 #define DRAM_DFS_SHU_MAX	DRAM_DFS_SHUFFLE_MAX