kontron-sl-mx8mm: fix missing configs and deadlock in CI

Even if board can be successfuly built, CI goes in deadlock (see thread
on https://www.mail-archive.com/u-boot@lists.denx.de/msg419663.html).
This is caused by SYS_CONFIG set in header file and because defconfig
for the board is out of sync with Kconfig. As result, buildman goes on
to read from stdin until an OOM is reached.
Signed-off-by: NStefano Babic <sbabic@denx.de>
CC: Frieder Schrempf <frieder.schrempf@kontron.de>

configs/kontron-sl-mx8mm_defconfig

@@ -8,6 +8,7 @@ CONFIG_SYS_MALLOC_F_LEN=0x10000
 CONFIG_ENV_SIZE=0x10000
 CONFIG_ENV_OFFSET=0x1f0000
 CONFIG_ENV_SECT_SIZE=0x10000
+CONFIG_SYS_MALLOC_LEN=0x4000000
 CONFIG_DM_GPIO=y
 CONFIG_SPL_DM_SPI=y
 CONFIG_DEFAULT_DEVICE_TREE="imx8mm-kontron-n801x-s"
@@ -17,6 +18,7 @@ CONFIG_SPL_MMC_SUPPORT=y
 CONFIG_SPL_SERIAL_SUPPORT=y
 CONFIG_BOOTCOUNT_BOOTLIMIT=3
 CONFIG_SPL=y
+CONFIG_SYS_LOAD_ADDR=0x40480000
 CONFIG_SPL_SPI_FLASH_SUPPORT=y
 CONFIG_SPL_SPI_SUPPORT=y
 CONFIG_DISTRO_DEFAULTS=y
@@ -25,7 +27,7 @@ CONFIG_FIT_EXTERNAL_OFFSET=0x3000
 CONFIG_SPL_LOAD_FIT=y
 # CONFIG_USE_SPL_FIT_GENERATOR is not set
 CONFIG_OF_BOARD_SETUP=y
-CONFIG_SYS_EXTRA_OPTIONS="IMX_CONFIG=board/kontron/sl-mx8mm/imximage.cfg"
+CONFIG_IMX_CONFIG="board/kontron/sl-mx8mm/imximage.cfg"
 CONFIG_BOARD_TYPES=y
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_SEPARATE_BSS=y

include/configs/kontron-sl-mx8mm.h

@@ -22,7 +22,6 @@
 #define CONFIG_SYS_INIT_RAM_ADDR	0x40000000
 #define CONFIG_SYS_INIT_RAM_SIZE	0x200000
 
-#define CONFIG_SYS_MALLOC_LEN		SZ_64M
 #define CONFIG_SYS_HZ			1000
 
 #define CONFIG_SYS_INIT_SP_OFFSET \
@@ -55,8 +54,6 @@
 #define BOOTENV
 #endif
 
-#define CONFIG_LOADADDR			0x40480000
-#define CONFIG_SYS_LOAD_ADDR		CONFIG_LOADADDR
 #define CONFIG_SYS_BOOTM_LEN		SZ_64M
 #define CONFIG_SPL_MAX_SIZE		(148 * SZ_1K)
 #define CONFIG_FSL_USDHC