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/zynq_cse_nor_defconfig b/configs/zynq_cse_nor_defconfig
index 41c8704..da7b9d0 100644
--- a/configs/zynq_cse_nor_defconfig
+++ b/configs/zynq_cse_nor_defconfig
@@ -22,6 +22,7 @@
 # CONFIG_BOARD_LATE_INIT is not set
 CONFIG_CLOCKS=y
 CONFIG_SPL_MAX_SIZE=0x30000
+CONFIG_SPL_BSS_MAX_SIZE=0x8000
 CONFIG_SPL_STACK_R=y
 # CONFIG_CMDLINE_EDITING is not set
 # CONFIG_AUTO_COMPLETE is not set