Merge branch '2021-08-31-kconfig-migrations-part2' into next

- Further CONFIG to Kconfig migrations
  - Some DDR related symbols
  - CONFIG_SYS_LOAD_ADDR moved, loadaddr always set in environment now.
  - Finish MX7D, convert IMX_CONFIG
  - Some RAMBOOT related options
  - L1 cache size converted and named consistently for all arches.  A
    further follow-up to rename things for even better clarity is welcome.
  - CONFIG_SKIP_LOWLEVEL_INIT, CONFIG_SYS_MALLOC_LEN

scripts/config_whitelist.txt

@@ -193,20 +193,6 @@ CONFIG_DB_784MP_GP
 CONFIG_DCACHE
 CONFIG_DCACHE_OFF
 CONFIG_DCFG_ADDR
-CONFIG_DDR_2T_TIMING
-CONFIG_DDR_32BIT
-CONFIG_DDR_64BIT
-CONFIG_DDR_CLK_FREQ
-CONFIG_DDR_DEFAULT_CL
-CONFIG_DDR_ECC
-CONFIG_DDR_ECC_CMD
-CONFIG_DDR_ECC_ENABLE
-CONFIG_DDR_ECC_INIT_VIA_DMA
-CONFIG_DDR_FIXED_SIZE
-CONFIG_DDR_II
-CONFIG_DDR_LOG_LEVEL
-CONFIG_DDR_MB
-CONFIG_DDR_SPD
 CONFIG_DEBUG
 CONFIG_DEBUG_FS
 CONFIG_DEBUG_LED
@@ -262,7 +248,6 @@ CONFIG_E1000_NO_NVM
 CONFIG_E300
 CONFIG_E5500
 CONFIG_ECC
-CONFIG_ECC_INIT_VIA_DDRCONTROLLER
 CONFIG_EDB9301
 CONFIG_EDB93XX_INDUSTRIAL
 CONFIG_EDB93XX_SDCS0
@@ -387,7 +372,6 @@ CONFIG_FSL_DEEP_SLEEP
 CONFIG_FSL_DEVICE_DISABLE
 CONFIG_FSL_DIU_CH7301
 CONFIG_FSL_DIU_FB
-CONFIG_FSL_DMA
 CONFIG_FSL_DSPI1
 CONFIG_FSL_ESDHC_PIN_MUX
 CONFIG_FSL_FIXED_MMC_LOCATION
@@ -652,7 +636,6 @@ CONFIG_IMA
 CONFIG_IMX
 CONFIG_IMX6_PWM_PER_CLK
 CONFIG_IMX_HDMI
-CONFIG_IMX_NAND
 CONFIG_IMX_VIDEO_SKIP
 CONFIG_INETSPACE_V2
 CONFIG_INITRD_TAG
@@ -787,7 +770,6 @@ CONFIG_LEGACY
 CONFIG_LEGACY_BOOTCMD_ENV
 CONFIG_LITTLETON_LCD
 CONFIG_LMS283GF05
-CONFIG_LOADADDR
 CONFIG_LOADS_ECHO
 CONFIG_LOWPOWER_ADDR
 CONFIG_LOWPOWER_FLAG
@@ -1090,7 +1072,6 @@ CONFIG_QSPI
 CONFIG_QUOTA
 CONFIG_RAMBOOTCOMMAND
 CONFIG_RAMBOOT_NAND
-CONFIG_RAMBOOT_PBL
 CONFIG_RAMBOOT_SDCARD
 CONFIG_RAMBOOT_SPIFLASH
 CONFIG_RAMBOOT_TEXT_BASE
@@ -1157,7 +1138,6 @@ CONFIG_S5PC100
 CONFIG_S5PC110
 CONFIG_S5P_PA_SYSRAM
 CONFIG_S6E8AX0
-CONFIG_SABRELITE
 CONFIG_SAMA5D3_LCD_BASE
 CONFIG_SAMSUNG
 CONFIG_SAMSUNG_ONENAND
@@ -1222,8 +1202,6 @@ CONFIG_SH_SDHI_FREQ
 CONFIG_SH_SDRAM_OFFSET
 CONFIG_SIEMENS_MACH_TYPE
 CONFIG_SKIP_LOCAL_MAC_RANDOMIZATION
-CONFIG_SKIP_LOWLEVEL_INIT
-CONFIG_SKIP_LOWLEVEL_INIT_ONLY
 CONFIG_SKIP_TRUNOFF_WATCHDOG
 CONFIG_SLIC
 CONFIG_SLTTMR
@@ -2003,8 +1981,6 @@ CONFIG_SYS_FSL_OCRAM_BASE
 CONFIG_SYS_FSL_OCRAM_SIZE
 CONFIG_SYS_FSL_OTHER_DDR_NUM_CTRLS
 CONFIG_SYS_FSL_PAMU_OFFSET
-CONFIG_SYS_FSL_PBL_PBI
-CONFIG_SYS_FSL_PBL_RCW
 CONFIG_SYS_FSL_PCIE_COMPAT
 CONFIG_SYS_FSL_PCI_VER_3_X
 CONFIG_SYS_FSL_PEBUF_BASE
@@ -2298,7 +2274,6 @@ CONFIG_SYS_LIME_BASE
 CONFIG_SYS_LIME_SIZE
 CONFIG_SYS_LINUX_LOWMEM_MAX_SIZE
 CONFIG_SYS_LOADS_BAUD_CHANGE
-CONFIG_SYS_LOAD_ADDR
 CONFIG_SYS_LOW
 CONFIG_SYS_LOWMEM_BASE
 CONFIG_SYS_LOW_RES_TIMER