Move existing use of CONFIG_SPL_DM to Kconfig

A few boards define this in a header file which is incorrect. It means that
Kconfig options that rely on this cannot be used. Move it.

Note that quite a few boards defined this options but do not appear to
actually use SPL:

	BSC9132QDS_NOR_DDRCLK100_SECURE
	BSC9132QDS_NOR_DDRCLK133_SECURE
	BSC9132QDS_SDCARD_DDRCLK100_SECURE
	BSC9132QDS_SDCARD_DDRCLK133_SECURE
	BSC9132QDS_SPIFLASH_DDRCLK100_SECURE
	BSC9132QDS_SPIFLASH_DDRCLK133_SECURE
	C29XPCIE_NOR_SECBOOT
	P1010RDB-PA_36BIT_NAND_SECBOOT
	P1010RDB-PA_36BIT_SPIFLASH_SECBOOT
	P1010RDB-PA_NAND_SECBOOT
	P1010RDB-PA_NOR_SECBOOT
	P1010RDB-PB_36BIT_NOR_SECBOOT
	P1010RDB-PB_36BIT_SPIFLASH_SECBOOT
	P1010RDB-PB_NAND_SECBOOT
	P1010RDB-PB_NOR_SECBOOT
	P3041DS_SECURE_BOOT
	P4080DS_SECURE_BOOT
	P5020DS_NAND_SECURE_BOOT
	P5040DS_SECURE_BOOT
	T1023RDB_SECURE_BOOT
	T1024QDS_DDR4_SECURE_BOOT
	T1024QDS_SECURE_BOOT
	T1024RDB_SECURE_BOOT
	T1040RDB_SECURE_BOOT
	T1042D4RDB_SECURE_BOOT
	T1042RDB_SECURE_BOOT
	T2080QDS_SECURE_BOOT
	T2080RDB_SECURE_BOOT
	T4160QDS_SECURE_BOOT
	T4240QDS_SECURE_BOOT
	ls1021aqds_nor_SECURE_BOOT
	ls1021atwr_nor_SECURE_BOOT
	ls1043ardb_SECURE_BOOT

For these boards CONFIG_SPL_DM will no-longer be defined in SPL. But since
they apparently don't have an SPL, this should not matter.

Signed-off-by: Simon Glass <sjg@chromium.org>

arch/arm/include/asm/fsl_secure_boot.h

@@ -27,7 +27,6 @@
 #endif
 
 #define CONFIG_SPL_BOARD_INIT
-#define CONFIG_SPL_DM			1
 #define CONFIG_SPL_CRYPTO_SUPPORT
 #define CONFIG_SPL_HASH_SUPPORT
 #define CONFIG_SPL_RSA

arch/powerpc/include/asm/fsl_secure_boot.h

@@ -80,7 +80,6 @@
 
 #ifdef CONFIG_CHAIN_OF_TRUST
 
-#define CONFIG_SPL_DM			1
 #define CONFIG_SPL_CRYPTO_SUPPORT
 #define CONFIG_SPL_HASH_SUPPORT
 #define CONFIG_SPL_RSA

configs/T1042RDB_PI_NAND_SECURE_BOOT_defconfig

@@ -20,6 +20,7 @@ CONFIG_CMD_PING=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_DM=y
+CONFIG_SPL_DM=y
 CONFIG_SPI_FLASH=y
 CONFIG_SPI_FLASH_STMICRO=y
 CONFIG_NETDEVICES=y

configs/ls1021atwr_sdcard_ifc_SECURE_BOOT_defconfig

@@ -21,6 +21,7 @@ CONFIG_CMD_PING=y
 CONFIG_CMD_EXT2=y
 CONFIG_CMD_FAT=y
 CONFIG_DM=y
+CONFIG_SPL_DM=y
 CONFIG_NETDEVICES=y
 CONFIG_E1000=y
 CONFIG_SYS_NS16550=y