am33xx: Stop using PHYS_DRAM_1 define

We defined PHYS_DRAM_1 to 0x80000000 (start of DRAM) and then used this
for CONFIG_SYS_SDRAM_BASE.  But then we kept on referencing PHYS_DRAM_1
in other places.  Change to directly setting CONFIG_SYS_DRAM_BASE and
then using that name in code.

Signed-off-by: Tom Rini <trini@ti.com>
diff --git a/include/configs/pcm051.h b/include/configs/pcm051.h
index a3f8ead..d4d4d79 100644
--- a/include/configs/pcm051.h
+++ b/include/configs/pcm051.h
@@ -123,7 +123,7 @@
  * memtest works on 8 MB in DRAM after skipping 32MB from
  * start addr of ram disk
  */
-#define CONFIG_SYS_MEMTEST_START	(PHYS_DRAM_1 + (64 * 1024 * 1024))
+#define CONFIG_SYS_MEMTEST_START	(CONFIG_SYS_SDRAM_BASE + (64 << 20))
 #define CONFIG_SYS_MEMTEST_END		(CONFIG_SYS_MEMTEST_START \
 					+ (8 * 1024 * 1024))
 
@@ -147,10 +147,9 @@
 
  /* Physical Memory Map */
 #define CONFIG_NR_DRAM_BANKS		1		/*  1 bank of DRAM */
-#define PHYS_DRAM_1			0x80000000	/* DRAM Bank #1 */
 #define CONFIG_MAX_RAM_BANK_SIZE	(1024 << 19)	/* 512MiB */
 
-#define CONFIG_SYS_SDRAM_BASE		PHYS_DRAM_1
+#define CONFIG_SYS_SDRAM_BASE		0x80000000
 #define CONFIG_SYS_INIT_SP_ADDR         (NON_SECURE_SRAM_END - \
 						GENERATED_GBL_DATA_SIZE)
  /* Platform/Board specific defs */