crypto: qat - remove cast for mailbox CSR

Remove cast for mailbox CSR in adf_admin.c as it is not needed.

Suggested-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Adam Guerin <[e-mail]>
Reviewed-by: Giovanni Cabiddu <[e-mail]>
Reviewed-by: Andy Shevchenko <[e-mail]>
Signed-off-by: Giovanni Cabiddu <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/crypto/qat/qat_common/adf_admin.c

···
 	hw_data->get_admin_info(&admin_csrs_info);
 
 	mailbox_offset = admin_csrs_info.mailbox_offset;
-	mailbox = (void __iomem *)((uintptr_t)csr + mailbox_offset);
+	mailbox = csr + mailbox_offset;
 	adminmsg_u = admin_csrs_info.admin_msg_ur;
 	adminmsg_l = admin_csrs_info.admin_msg_lr;