This commit fixes a bug wherein an incorrect bit-width of 0 was being
used while reading the RTC_CNTL_LOW_POWER_ST_REG in ulp_fsm example code
while judging whether the system is ready for wakeup. The correct value
should be a bit-width of 1 to read bit#27 (RTC_CNTL_MAIN_STATE_IDLE) of
the RTC_CNTL_LOW_POWER_ST_REG register on esp32.
Due to poor accuracy the ESP32 ULP TSENS instructions is not recommend for use.
We keep the instruction itself to support users which are already using it,
but should remove it from examples and docs to avoid encouring any new usage of it.