Add cros_debug option to crossystem (R11 branch)

Add cros_debug option to crossystem (R11 branch)
Add check-value support and check /proc/cmdline for cros_nodebug

Change-Id: I35158810184be03f18d98893e4dd640088384579

BUG=12904
TEST=manual

crossystem fwb_tries=1
crossystem fwb_tries?1 && echo YES || echo NO --> YES
crossystem fwb_tries?0x01 && echo YES || echo NO --> YES
crossystem fwb_tries?0 && echo YES || echo NO --> NO

crossystem fwb_tries=0
crossystem fwb_tries?0 && echo YES || echo NO --> YES
crossystem fwb_tries?1 && echo YES || echo NO --> NO
crossystem fwb_tries?0x01 && echo YES || echo NO --> NO

crossystem ecfw_act --> RW (if it's not, change RW to RO in the tests below)
crossystem ecfw_act?RW && echo YES || echo NO --> YES
crossystem ecfw_act?BOB && echo YES || echo NO --> NO

For the following tests, boot Alex with dev switch on and fwb_tries=1
Expected output of `crossystem mainfw_type mainfw_act cros_debug` under each of the following scenarios:
* Neither "cros_debug" nor" cros_nodebug" in kernel command line: normal B 1
* Kernel command line changed to include "cros_nodebug": normal B 0
* Kernel command line changed to include "cros_nodebugg": normal B 1
* Kernel command line changed to include "ccros_nodebug": normal B 1

Review URL: http://codereview.chromium.org/6665005
(cherry picked from commit 227f792c1ba64eb8dd3474395659e27696fcf355)

Add cros_debug option to crossystem

Change-Id: Ie62364a87f7f144ee647054d2a9ef83522cdbe7d

BUG=12904
TEST=manual

Expected output of `crossystem mainfw_type cros_debug` under each of the following scenarios:

* Boot Alex with dev switch off: normal 0
* Boot Alex with dev switch on (and dev firmware): developer 1
* Boot Alex with dev switch on (and normal firmware): normal 1
* Boot Alex with recovery firmware: recovery 0
* Boot Alex with dev switch off, then turn the dev switch on after booting: normal 0
* Boot Cr-48 with dev switch off: normal 0
* Boot Cr-48 with dev switch on: developer 1
* Boot Cr-48 with recovery firmware: recovery 0

* Boot Alex with dev switch off and kernel command line changed to include "cros_debug": normal 1
* Boot Alex with dev switch off and kernel command line changed to include "cros_debugg": normal 0
* Boot Alex with dev switch off and kernel command line changed to include "ccros_debug": normal 0

* Boot H2O BIOS with kernel command line changed to include "cros_debug": nonchrome 1
* Boot H2O BIOS with kernel command line changed to include "cros_debugg": nonchrome 0
* Boot H2O BIOS with kernel command line changed to include "ccros_debug": nonchrome 0

Review URL: http://codereview.chromium.org/6659021
(cherry picked from commit 196e1772ed9092a679767c0497343799f13d2875)

Committed: http://chrome-svn/viewvc/chromeos?view=rev&revision=4a16d08

[gauravsh, 2011-03-12 03:13:56]

lgtm