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/omap5_uevm_defconfig b/configs/omap5_uevm_defconfig
index 748b012..beccc82 100644
--- a/configs/omap5_uevm_defconfig
+++ b/configs/omap5_uevm_defconfig
@@ -14,6 +14,7 @@
 CONFIG_BOOTCOMMAND="if test ${dofastboot} -eq 1; then echo Boot fastboot requested, resetting dofastboot ...;setenv dofastboot 0; saveenv;echo Booting into fastboot ...; fastboot 1;fi;if test ${boot_fit} -eq 1; then run update_to_fit;fi;run findfdt; run finduuid; run distro_bootcmd;run emmc_android_boot; "
 CONFIG_DEFAULT_FDT_FILE="omap5-uevm.dtb"
 CONFIG_SYS_CONSOLE_INFO_QUIET=y
+CONFIG_SPL_MAX_SIZE=0x1dc00
 # CONFIG_SPL_NAND_SUPPORT is not set
 CONFIG_SPL_OS_BOOT=y
 CONFIG_SPL_FALCON_BOOT_MMCSD=y