iio: pressure: sdp500: Add missing select CRC8

iio: pressure: sdp500: Add missing select CRC8

Fix:
   sh4-linux-ld: drivers/iio/pressure/sdp500.o: in function `sdp500_probe':
>> drivers/iio/pressure/sdp500.c:130:(.text+0xe8): undefined reference to `crc8_populate_msb'
   sh4-linux-ld: drivers/iio/pressure/sdp500.o: in function `sdp500_read_raw':
>> drivers/iio/pressure/sdp500.c:74:(.text+0x200): undefined reference to `crc8'

by adding missing select.

Reviewed-by: Javier Carrasco <javier.carrasco.cruz@gmail.com>
Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202409271341.0dhpXk7G-lkp@intel.com/
Link: https://patch.msgid.link/20240929172105.1819259-1-jic23@kernel.org
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>