add full crossystem output to chrome://system

In order to help dev/normal mode switch debugging,
let's append the full output of "crossystem --all" at the end of the
bios_info section.

BUG=chromium-os:33231
TEST=on Link, open chrome://system web page and see the crossystem
output in the debugd-bios_info section.

Change-Id: I7d6f9cab51d6759934a3288ea5b0b675d7a550fe
Reviewed-on: https://gerrit.chromium.org/gerrit/29176
Tested-by: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Puneet Kumar <puneetster@chromium.org>
Commit-Ready: Vincent Palatin <vpalatin@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>

scripts/bios_info

diff --git a/scripts/bios_info b/scripts/bios_info
index 3f340d7..0c72b4f 100755
--- a/scripts/bios_info
+++ b/scripts/bios_info
@@ -76,5 +76,7 @@
 Boot reason $(bootreason)
 Boot firmware: $(crossystem 'mainfw_act')
 Active EC code: $(crossystem 'ecfw_act')
+Raw log:
+$(crossystem --all)
 END