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/rock_defconfig b/configs/rock_defconfig
index 9ec2c4b..0c10338 100644
--- a/configs/rock_defconfig
+++ b/configs/rock_defconfig
@@ -24,6 +24,7 @@
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 CONFIG_SPL_MAX_SIZE=0x7800
 CONFIG_SPL_PAD_TO=0x7f8000
+CONFIG_SPL_NO_BSS_LIMIT=y
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x2000
 CONFIG_RANDOM_UUID=y