novena: Remove uneeded PHYS_SDRAM_SIZE

novena uses the imx_ddr_size() function to calculate the DDR size in
runtime, so there is no need to define PHYS_SDRAM_SIZE.

Remove the unneeded definition.

Cc: Marek Vasut <marex@denx.de>
Signed-off-by: Fabio Estevam <fabio.estevam@nxp.com>
Acked-by: Marek Vasut <marex@denx.de>

include/configs/novena.h

@@ -57,7 +57,6 @@
 /* Physical Memory Map */
 #define CONFIG_NR_DRAM_BANKS		1
 #define PHYS_SDRAM			MMDC0_ARB_BASE_ADDR
-#define PHYS_SDRAM_SIZE			0xF0000000
 
 #define CONFIG_SYS_SDRAM_BASE		PHYS_SDRAM
 #define CONFIG_SYS_INIT_RAM_ADDR	IRAM_BASE_ADDR