Convert CONFIG_SPL_PAD_TO et al to Kconfig

This converts the following to Kconfig:
   CONFIG_SPL_PAD_TO
   CONFIG_SPL_MAX_SIZE
   CONFIG_TPL_PAD_TO
   CONFIG_TPL_MAX_SIZE

Note that we need to make TPL_MAX_SIZE be hex, and so move and convert the
existing places.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/xilinx_zynqmp_virt_defconfig b/configs/xilinx_zynqmp_virt_defconfig
index 35625a4..91c65c9 100644
--- a/configs/xilinx_zynqmp_virt_defconfig
+++ b/configs/xilinx_zynqmp_virt_defconfig
@@ -31,6 +31,7 @@
 CONFIG_PREBOOT="run scsi_init;usb start"
 CONFIG_BOARD_EARLY_INIT_R=y
 CONFIG_CLOCKS=y
+CONFIG_SPL_MAX_SIZE=0x40000
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_FS_LOAD_KERNEL_NAME="atf-uboot.ub"
 CONFIG_SPL_FS_LOAD_ARGS_NAME="u-boot.bin"