Merge branch '2022-06-28-Kconfig-migrations' into next

- Convert a large number of CONFIG symbols to Kconfig.  Of note is a
  large chunk of USB symbols (and dead code removal), ensuring all
  SPL/TPL/VPL symbols have an appropriate dependency, largely (but not
  entirely) removing the testing of CONFIG_SPL_BUILD in board headers,
  and allowing CONFIG_EXTRA_ENV_TEXT and CONFIG_EXTRA_ENV_SETTINGS to
  co-exist as this facilities migration of many platforms.
diff --git a/configs/evb-ast2600_defconfig b/configs/evb-ast2600_defconfig
index a91a53d..5c4d842 100644
--- a/configs/evb-ast2600_defconfig
+++ b/configs/evb-ast2600_defconfig
@@ -1,7 +1,6 @@
 CONFIG_ARM=y
 CONFIG_SYS_DCACHE_OFF=y
 CONFIG_SPL_SYS_THUMB_BUILD=y
-CONFIG_SPL_LDSCRIPT="arch/arm/mach-aspeed/ast2600/u-boot-spl.lds"
 CONFIG_ARCH_ASPEED=y
 CONFIG_SYS_TEXT_BASE=0x80000000
 CONFIG_SYS_MALLOC_LEN=0x2000000
@@ -11,6 +10,7 @@
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=1
+CONFIG_SPL_LDSCRIPT="arch/arm/mach-aspeed/ast2600/u-boot-spl.lds"
 CONFIG_ENV_SIZE=0x10000
 CONFIG_DM_GPIO=y
 CONFIG_DEFAULT_DEVICE_TREE="ast2600-evb"