servo_v4: add more stack for PD
C0 PD would occasionally get stack overflow.
Add venti stack.
BRANCH=servo
TEST=no more crash
#define CONFIG_TASK_LIST \
TASK_ALWAYS(HOOKS, hook_task, NULL, VENTI_TASK_STACK_SIZE) \
TASK_ALWAYS(CONSOLE, console_task, NULL, TASK_STACK_SIZE) \
- TASK_ALWAYS(PD_C0, pd_task, NULL, LARGER_TASK_STACK_SIZE) \
+ TASK_ALWAYS(PD_C0, pd_task, NULL, VENTI_TASK_STACK_SIZE) \
TASK_ALWAYS(PD_C1, pd_task, NULL, VENTI_TASK_STACK_SIZE)
