[chip dv] Fix PWM test
[chip dv] Fix PWM test

A typo in tb.sv misconnected IOC11 and 12 to the same pin.

Test fixed by this commit:
- chip_sw_sleep_pwm_pulses

Signed-off-by: Srikrishna Iyer <2803d640feace36379942447842f26c7747b4dc3@google.com>

lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan,lowRISC/opentitan