x86: coral: Update the memory map

This currently excludes the temporary memory used to start up the APs.
Add it.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Wolfgang Wallner <wolfgang.wallner@br-automation.com>
diff --git a/doc/board/google/chromebook_coral.rst b/doc/board/google/chromebook_coral.rst
index 40bd939..c39f1e3 100644
--- a/doc/board/google/chromebook_coral.rst
+++ b/doc/board/google/chromebook_coral.rst
@@ -188,6 +188,7 @@
     fef00000  1000 CONFIG_BOOTSTAGE_STASH_ADDR
     fef00000       Base of CAR region
 
+       30000       AP_DEFAULT_BASE (used to start up additional CPUs)
        f0000       CONFIG_ROM_TABLE_ADDR
       120000       BSS (defined in u-boot-spl.lds)
       200000       FSP-S (which is run after U-Boot is relocated)