sys/dev/arcmsr: Update Areca RAID driver to version 1.50.00.06.

• Suppressed a harmless warning message, "arcmsr_dr_handle: target=f, lun=0, GONE!!!," which could appear a few seconds after UEFI system boot due to the boot volume UEFI initialization.
• Corrected various typing errors.
• Refactored arcmsr_initialize() to improve code readability.
• Added support for device IDs 1883 and 1886 controllers.
• Introduced support for controllers requiring host memory for the RAID 5 and 6 XOR engines.

Many thanks to Areca for continuing to support FreeBSD.

Approved by: re (gjb)

(cherry picked from commit cb1a0aab4f3ca169509ab86a67a4630e72790869)
(cherry picked from commit 72a9f518d5973bb1cd371cff8ee4e3f24c410e42)