configs: omapl138_lcdk: decrease the loglevel to reduce the size of the SPL

The changes in the MMC stack have increased its footprint up to the point
were its breaks the generation of the SPL for this platform.
Fix this by reducing the loglevel.

Signed-off-by: Jean-Jacques Hiblot <jjhiblot@ti.com>
Reviewed-by: Peter Howard <phoward@gme.net.au>
diff --git a/configs/omapl138_lcdk_defconfig b/configs/omapl138_lcdk_defconfig
index 8d6b12f..0d4506e 100644
--- a/configs/omapl138_lcdk_defconfig
+++ b/configs/omapl138_lcdk_defconfig
@@ -8,6 +8,7 @@
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_SPL_NAND_SUPPORT=y
 CONFIG_BOOTDELAY=3
+CONFIG_LOGLEVEL=3
 CONFIG_VERSION_VARIABLE=y
 # CONFIG_DISPLAY_CPUINFO is not set
 # CONFIG_DISPLAY_BOARDINFO is not set