misc: atsha204a: Fix big endian support

Callers of function atsha204a_crc16() expect to return value in host cpu
endianity. So remove cpu_to_le16() conversion.

Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
Reviewed-by: Marek Behún <marek.behun@nic.cz>