scsi: arcmsr: Update driver version to v1.50.00.04-20210414

Update driver version to v1.50.00.04-20210414.

Link: https://lore.kernel.org/r/1ca5474a5c6fea59bf13cdf84f7bd17f0b20f562.camel@areca.com.tw


Signed-off-by: ching Huang <ching2048@areca.com.tw>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>