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/evb-rk3036_defconfig b/configs/evb-rk3036_defconfig
index dcc70cb..ea4427e 100644
--- a/configs/evb-rk3036_defconfig
+++ b/configs/evb-rk3036_defconfig
@@ -23,6 +23,7 @@
 # CONFIG_DISPLAY_CPUINFO is not set
 CONFIG_DISPLAY_BOARDINFO_LATE=y
 # CONFIG_SPL_FRAMEWORK is not set
+CONFIG_SPL_PAD_TO=0x7f8000
 CONFIG_SPL_STACK_R=y
 CONFIG_CMD_GPT=y
 CONFIG_CMD_I2C=y