iio: st_pressure: initialize lps22hb bootime

BugLink: https://bugs.launchpad.net/bugs/1682103

This patch initializes the bootime in struct st_sensor_settings for
lps22hb sensor. Without this, sensor channels read from sysfs always
report stale values.
Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <jic23@kernel.org>
(backported from commit 51f528a1)
Signed-off-by: Shrirang Bagul <shrirang.bagul@canonical.com>
Acked-by: Tim Gardner <tim.gardner@canonical.com>
Acked-by: Joseph Salisbury <joseph.salisbury@canonical.com>
Signed-off-by: Stefan Bader <stefan.bader@canonical.com>

drivers/iio/pressure/st_pressure_core.c

@@ -521,6 +521,7 @@ static const struct st_sensor_settings st_press_sensors_settings[] = {
 			.mask_int2 = ST_PRESS_LPS22HB_DRDY_IRQ_INT2_MASK,
 		},
 		.multi_read_bit = ST_PRESS_LPS22HB_MULTIREAD_BIT,
+		.bootime = 2,
 	},
 };