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/rock_defconfig b/configs/rock_defconfig
index 4aa4608..9ec2c4b 100644
--- a/configs/rock_defconfig
+++ b/configs/rock_defconfig
@@ -22,6 +22,8 @@
 CONFIG_DEFAULT_FDT_FILE="rk3188-radxarock.dtb"
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y
+CONFIG_SPL_MAX_SIZE=0x7800
+CONFIG_SPL_PAD_TO=0x7f8000
 CONFIG_SPL_STACK_R=y
 CONFIG_SPL_STACK_R_MALLOC_SIMPLE_LEN=0x2000
 CONFIG_RANDOM_UUID=y