scsi: megaraid_sas: Move megasas_dbg_lvl init to megasas_init()

The megasas_dbg_lvl is a driver level parameter. Do not initialize it in
the probe path. Otherwise we will miss the debug print when binding a
new device to the megaraid driver.

Link: https://lore.kernel.org/r/1663145283-4872-6-git-send-email-kanie@linux.alibaba.com


Acked-by: Sumit Saxena <sumit.saxena@broadcom.com>
Signed-off-by: Guixin Liu <kanie@linux.alibaba.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>