configs: omap3x_logic: Enable LTO on more LogicPD OMAP3 boards

There are five omap3 based boards from LogicPD.  Two of them
have added LTO support. Add the remaining three to use LTO.

Signed-off-by: Adam Ford <aford173@gmail.com>
diff --git a/configs/omap35_logic_defconfig b/configs/omap35_logic_defconfig
index 9d8ac94..db38d78 100644
--- a/configs/omap35_logic_defconfig
+++ b/configs/omap35_logic_defconfig
@@ -12,6 +12,7 @@
 CONFIG_TARGET_OMAP3_LOGIC=y
 # CONFIG_SPL_OMAP3_ID_NAND is not set
 CONFIG_SPL=y
+CONFIG_LTO=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_ANDROID_BOOT_IMAGE=y
 # CONFIG_USE_BOOTCOMMAND is not set