aacraid: use kmemdup

aacraid: use kmemdup

Use kmemdup when some other buffer is immediately copied into allocated
region. It replaces call to allocation followed by memcpy, by a single
call to kmemdup.

Signed-off-by: Muhammad Falak R Wani <falakreyaz@gmail.com>
Reviewed-by: Raghava Aditya Renukunta <RaghavaAditya.Renukunta@microsemi.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
(cherry picked from commit 22e9f5a61666ed1145a09fbe49ac1a6f2ae7be8e)

Orabug: 25505509
Signed-off-by: Dhaval Giani <dhaval.giani@oracle.com>