ARM: imx: Revert "dh_imx6: Switch to full DM-aware"

This reverts commit 03a673cf ("dh_imx6: Switch to full DM-aware").
According to discussion [1], the patch is known to break the dh_imx6
board, however it made it upstream just before 2021.01-rc4, likely by
mistake. Revert this patch to put the board back into working order.

Also note that this board has no DM SPL support due to OCRAM size
limitations, but that is fine, as SPL DM support is optional.

[1] https://lists.denx.de/pipermail/u-boot/2020-June/417986.htmlSigned-off-by: NMarek Vasut <marex@denx.de>
Cc: Andreas Geisreiter <ageisreiter@dh-electronics.de>
Cc: Jagan Teki <jagan@amarulasolutions.com>
Cc: Ludwig Zenz <lzenz@dh-electronics.de>
Cc: Stefano Babic <sbabic@denx.de>
Cc: Tom Rini <trini@konsulko.com>

configs/dh_imx6_defconfig

@@ -54,14 +54,12 @@ CONFIG_CMD_CACHE=y
 CONFIG_CMD_TIME=y
 CONFIG_CMD_EXT4_WRITE=y
 CONFIG_OF_CONTROL=y
-CONFIG_SPL_OF_CONTROL=y
 CONFIG_OF_LIST="imx6q-dhcom-pdk2 imx6dl-dhcom-pdk2"
 CONFIG_MULTI_DTB_FIT=y
 CONFIG_ENV_OVERWRITE=y
 CONFIG_ENV_IS_IN_SPI_FLASH=y
 CONFIG_SYS_REDUNDAND_ENVIRONMENT=y
 CONFIG_SYS_RELOC_GD_ENV_ADDR=y
-CONFIG_SPL_DM=y
 CONFIG_BOUNCE_BUFFER=y
 CONFIG_DWC_AHSATA=y
 CONFIG_BOOTCOUNT_LIMIT=y
@@ -108,5 +106,4 @@ CONFIG_CI_UDC=y
 CONFIG_USB_GADGET_DOWNLOAD=y
 CONFIG_WATCHDOG_TIMEOUT_MSECS=60000
 CONFIG_IMX_WATCHDOG=y
-# CONFIG_SPL_WDT is not set
 CONFIG_BZIP2=y

include/configs/dh_imx6.h

@@ -52,6 +52,12 @@
 /* SATA Configs */
 #define CONFIG_LBA48
 
+/* SPI Flash Configs */
+#if defined(CONFIG_SPL_BUILD)
+#undef CONFIG_DM_SPI
+#undef CONFIG_DM_SPI_FLASH
+#endif
+
 /* UART */
 #define CONFIG_MXC_UART_BASE		UART1_BASE