drivers: sensor: ams/tsl2591: Don't check return code of initial reset

The TSL2591 driver fails to initialize because the sensor responds with a
NACK on the initial RESET. Although the datasheet from Adafruit claims that
this is operation should be valid (RESET is part of the CONTROL register),
other sample non-Zephyr drivers provided by Arduino don't explicitly reset
the sensor on initialization (see
https://github.com/adafruit/Adafruit_TSL2591_Library/blob/master/Adafruit_TSL2591.cpp

).
Thus, the assumption is that when the sensor is reset via software, it
doesn't respond to an ACK.

After removing the check for this initial RESET, the driver initializes
successfully.

Signed-off-by: Mohammed Billoo <mab@mab-labs.com>