configs: omap3_logic: Disable NAND ID during SPL

For these boards, the GPMC timings are more determined by
processor speed/type than the NAND/PoP memory.  This code
is never invoked, so disable the config option, so it doesn't
take the time to compile it in.

Signed-off-by: Adam Ford <aford173@gmail.com>

configs/omap3_logic_defconfig

@@ -3,6 +3,7 @@ CONFIG_ARCH_OMAP2PLUS=y
 CONFIG_TI_COMMON_CMD_OPTIONS=y
 CONFIG_SYS_MALLOC_F_LEN=0x2000
 CONFIG_TARGET_OMAP3_LOGIC=y
+# CONFIG_SPL_OMAP3_ID_NAND is not set
 CONFIG_SPL=y
 CONFIG_DEFAULT_DEVICE_TREE="logicpd-torpedo-37xx-devkit"
 CONFIG_DISTRO_DEFAULTS=y