Convert CONFIG_SPL_BSS_MAX_SIZE et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_BSS_MAX_SIZE
   CONFIG_SPL_MAX_FOOTPRINT

Note that the da850evm platforms were violating the "only use one" rule
here, and so now hard-code their BSS limit.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/edminiv2_defconfig b/configs/edminiv2_defconfig
index f18e483..dfb3e86 100644
--- a/configs/edminiv2_defconfig
+++ b/configs/edminiv2_defconfig
@@ -21,6 +21,7 @@
 CONFIG_ARCH_MISC_INIT=y
 CONFIG_RESET_PHY_R=y
 CONFIG_SPL_MAX_SIZE=0xfff0
+CONFIG_SPL_BSS_MAX_SIZE=0x1ffff
 CONFIG_SPL_BOARD_INIT=y
 CONFIG_SPL_NOR_SUPPORT=y
 CONFIG_HUSH_PARSER=y