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/qemu-ppce500_defconfig b/configs/qemu-ppce500_defconfig
index 3b3632f..eac2cc2 100644
--- a/configs/qemu-ppce500_defconfig
+++ b/configs/qemu-ppce500_defconfig
@@ -9,6 +9,7 @@
 CONFIG_FIT=y
 CONFIG_FIT_VERBOSE=y
 CONFIG_OF_STDOUT_VIA_ALIAS=y
+CONFIG_SYS_MONITOR_BASE=0x00F01000
 CONFIG_BOOTDELAY=1
 CONFIG_USE_BOOTCOMMAND=y
 CONFIG_BOOTCOMMAND="test -n \"$qemu_kernel_addr\" && bootm $qemu_kernel_addr - $fdtcontroladdr"