Cr50: Let NVMEM take more time and memory

We were getting occasional stack overflow and watchdog timeouts
when clearing NVMEM. Bump up the stack size a bit in the HOOKS
task, and pet the watchdog before invoking the tpm2 init
functions.

BUG=chrome-os-partner:59419
BRANCH=none
TEST=make buildall, manual

Lock the console, then unlock it. This will reboot the EC & AP,
but should never reboot the Cr50.

Before this CL, it did about half the time.
After, it doesn't.

Change-Id: I33adfeb7360bf7d146a55ef16c923a1a0416393d
Signed-off-by: Bill Richardson <wfrichar@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/407847
Reviewed-by: Vadim Bendebury <vbendeb@chromium.org>

board/cr50/ec.tasklist

@@ -17,6 +17,6 @@
  * 's' is the stack size in bytes; must be a multiple of 8
  */
 #define CONFIG_TASK_LIST \
-	TASK_ALWAYS(HOOKS, hook_task, NULL, LARGER_TASK_STACK_SIZE) \
+	TASK_ALWAYS(HOOKS, hook_task, NULL, CONFIG_STACK_SIZE) \
 	TASK_NOTEST(TPM, tpm_task, NULL, 8192) \
 	TASK_ALWAYS(CONSOLE, console_task, NULL, TASK_STACK_SIZE)

common/tpm_registers.c

@@ -533,6 +533,8 @@ static void tpm_init(void)
 	/* Create version string to be read by host */
 	set_version_string();
 
+	watchdog_reload();
+
 	/*
 	 * Make sure NV RAM metadata is initialized, needed to check
 	 * manufactured status. This is a speculative call which will have to