env: Finish migration of common ENV options

- In ARMv8 NXP Layerscape platforms we also need to make use of
  CONFIG_SYS_RELOC_GD_ENV_ADDR now, do so.
- On ENV_IS_IN_REMOTE, CONFIG_ENV_OFFSET is never used, drop the define
  to 0.
- Add Kconfig entry for ENV_ADDR.
- Make ENV_ADDR / ENV_OFFSET depend on the env locations that use it.
- Add ENV_xxx_REDUND options that depend on their primary option and
  SYS_REDUNDAND_ENVIRONMENT
- On a number of PowerPC platforms, use SPL_ENV_ADDR not CONFIG_ENV_ADDR
  for the pre-main-U-Boot environment location.
- On ENV_IS_IN_SPI_FLASH, check not for CONFIG_ENV_ADDR being set but
  rather it being non-zero, as it will now be zero by default.
- Rework the env_offset absolute in env/embedded.o to not use
  CONFIG_ENV_OFFSET as it was the only use of ENV_OFFSET within
  ENV_IS_IN_FLASH.
- Migrate all platforms.

Cc: Wolfgang Denk <wd@denx.de>
Cc: Joe Hershberger <joe.hershberger@ni.com>
Cc: Patrick Delaunay <patrick.delaunay@st.com>
Cc: uboot-stm32@st-md-mailman.stormreply.com
Signed-off-by: Tom Rini <trini@konsulko.com>
Acked-by: Joe Hershberger <joe.hershberger@ni.com>
Reviewed-by: Simon Goldschmidt <simon.k.r.goldschmidt@gmail.com>
diff --git a/board/freescale/t104xrdb/spl.c b/board/freescale/t104xrdb/spl.c
index 7df371d..2d1342f 100644
--- a/board/freescale/t104xrdb/spl.c
+++ b/board/freescale/t104xrdb/spl.c
@@ -110,17 +110,17 @@
 	defined(CONFIG_ENV_IS_IN_SPI_FLASH)
 #ifdef CONFIG_SPL_NAND_BOOT
 	nand_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
-			    (uchar *)CONFIG_ENV_ADDR);
+			    (uchar *)SPL_ENV_ADDR);
 #endif
 #ifdef CONFIG_SPL_MMC_BOOT
 	mmc_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
-			   (uchar *)CONFIG_ENV_ADDR);
+			   (uchar *)SPL_ENV_ADDR);
 #endif
 #ifdef CONFIG_SPL_SPI_BOOT
 	fsl_spi_spl_load_image(CONFIG_ENV_OFFSET, CONFIG_ENV_SIZE,
-			       (uchar *)CONFIG_ENV_ADDR);
+			       (uchar *)SPL_ENV_ADDR);
 #endif
-	gd->env_addr  = (ulong)(CONFIG_ENV_ADDR);
+	gd->env_addr  = (ulong)(SPL_ENV_ADDR);
 	gd->env_valid = ENV_VALID;
 #endif