Merge branch '2021-12-01-Kconfig-migrations' into next

- Finish converting CONFIG_USE_BOOTCOMMAND, CONFIG_BOOTCOMMAND,
  CONFIG_RAMBOOTCOMMAND, CONFIG_NFSBOOTCOMMAND, all of
  CONFIG_SYS_[BO]R[0-7]_PRELIM, CONFIG_FSL_DDR_BIST and
  CONFIG_FSL_DDR_INTERACTIVE.

diff --cc scripts/config_whitelist.txt
index 1e1ef76175d62c0721609e00233435a08f7b87a3,1e1ef76175d62c0721609e00233435a08f7b87a3..50dd3f92e7860a241d2ba9df310e5199845ed2d0
--- 1/scripts/config_whitelist.txt
--- 2/scripts/config_whitelist.txt
+++ b/scripts/config_whitelist.txt
@@@ -858,7 -858,7 +858,6 @@@ CONFIG_NETSPACE_V
  CONFIG_NET_MULTI
  CONFIG_NET_RETRY_COUNT
  CONFIG_NEVER_ASSERT_ODT_TO_CPU
--CONFIG_NFSBOOTCOMMAND
  CONFIG_NFS_TIMEOUT
  CONFIG_NOBQFMAN
  CONFIG_NON_SECURE
@@@ -981,7 -981,7 +980,6 @@@ CONFIG_QBMAN_CLK_DI
  CONFIG_QIXIS_I2C_ACCESS
  CONFIG_QSPI
  CONFIG_QUOTA
--CONFIG_RAMBOOTCOMMAND
  CONFIG_RAMBOOT_NAND
  CONFIG_RAMBOOT_SPIFLASH
  CONFIG_RAMBOOT_TEXT_BASE