arm: lpc32xx: remove phantom CONFIG_LPC32XX_SDRAM_ config option

The option has never existed and config whitelist script accumulates
it from a comment block, wipe it out from the source code.

Signed-off-by: Vladimir Zapolskiy <vz@mleia.com>
diff --git a/arch/arm/cpu/arm926ejs/lpc32xx/dram.c b/arch/arm/cpu/arm926ejs/lpc32xx/dram.c
index 2dce002..4f97569 100644
--- a/arch/arm/cpu/arm926ejs/lpc32xx/dram.c
+++ b/arch/arm/cpu/arm926ejs/lpc32xx/dram.c
@@ -8,9 +8,6 @@
  * This is called by SPL to gain access to the SDR DRAM.
  *
  * This code runs from SRAM.
- *
- * Actual CONFIG_LPC32XX_SDRAM_* parameters must be provided
- * by the board configuration file.
  */
 
 #include <common.h>
diff --git a/scripts/config_whitelist.txt b/scripts/config_whitelist.txt
index b566bfe..b6c793c 100644
--- a/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@ -1178,7 +1178,6 @@
 CONFIG_LPC32XX_NAND_SLC_WHOLD
 CONFIG_LPC32XX_NAND_SLC_WSETUP
 CONFIG_LPC32XX_NAND_SLC_WWIDTH
-CONFIG_LPC32XX_SDRAM_
 CONFIG_LPC32XX_SSP_TIMEOUT
 CONFIG_LPC_BASE
 CONFIG_LPC_IO_BASE