Convert CONFIG_SYS_MONITOR_BASE to Kconfig

This converts the following to Kconfig:
   CONFIG_SYS_MONITOR_BASE

Note that for how this is re-used on some PowePC platforms, we introduce
CONFIG_SPL_SYS_MONITOR_BASE and CONFIG_TPL_SYS_MONITOR_BASE and use the
CONFIG_VAL macro to get the correct value at build time, in the code.

Signed-off-by: Tom Rini <trini@konsulko.com>
diff --git a/configs/edison_defconfig b/configs/edison_defconfig
index be19832..3af97d8 100644
--- a/configs/edison_defconfig
+++ b/configs/edison_defconfig
@@ -10,6 +10,7 @@
 CONFIG_TARGET_EDISON=y
 CONFIG_SMP=y
 CONFIG_SYS_LOAD_ADDR=0x100000
+CONFIG_SYS_MONITOR_BASE=0x01101000
 CONFIG_BOARD_EARLY_INIT_R=y
 CONFIG_LAST_STAGE_INIT=y
 CONFIG_HUSH_PARSER=y