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/taurus_defconfig b/configs/taurus_defconfig
index c0a4dcc..cf538d0 100644
--- a/configs/taurus_defconfig
+++ b/configs/taurus_defconfig
@@ -8,7 +8,6 @@
 # CONFIG_SPL_USE_ARCH_MEMCPY is not set
 # CONFIG_SPL_USE_ARCH_MEMSET is not set
 CONFIG_ARCH_AT91=y
-CONFIG_SPL_LDSCRIPT="arch/arm/cpu/u-boot-spl.lds"
 CONFIG_SYS_TEXT_BASE=0x21000000
 CONFIG_SYS_MALLOC_LEN=0x460000
 CONFIG_TARGET_TAURUS=y
@@ -19,6 +18,7 @@
 CONFIG_SPL_LIBCOMMON_SUPPORT=y
 CONFIG_SPL_LIBGENERIC_SUPPORT=y
 CONFIG_NR_DRAM_BANKS=1
+CONFIG_SPL_LDSCRIPT="arch/arm/cpu/u-boot-spl.lds"
 CONFIG_ENV_OFFSET=0x100000
 CONFIG_SPL_DM_SPI=y
 CONFIG_DEFAULT_DEVICE_TREE="at91sam9g20-taurus"