firmware: imx: misc: Align imx sc msg structs to 4

The imx SC api strongly assumes that messages are composed out of
4-bytes words but some of our message structs have odd sizeofs.

This produces many oopses with CONFIG_KASAN=y:

    BUG: KASAN: stack-out-of-bounds in imx_mu_send_data+0x108/0x1f0

It shouldn't cause an issues in normal use because these structs are
always allocated on the stack.

Fixes: 15e1f2b ("firmware: imx: add misc svc support")
Signed-off-by: Leonard Crestez <[email protected]>
Signed-off-by: Shawn Guo <[email protected]>

Author: cdleonard

drivers/firmware/imx/misc.c

@@ -16,7 +16,7 @@ struct imx_sc_msg_req_misc_set_ctrl {
 	u32 ctrl;
 	u32 val;
 	u16 resource;
-} __packed;
+} __packed __aligned(4);
 
 struct imx_sc_msg_req_cpu_start {
 	struct imx_sc_rpc_msg hdr;
@@ -30,12 +30,12 @@ struct imx_sc_msg_req_misc_get_ctrl {
 	struct imx_sc_rpc_msg hdr;
 	u32 ctrl;
 	u16 resource;
-} __packed;
+} __packed __aligned(4);
 
 struct imx_sc_msg_resp_misc_get_ctrl {
 	struct imx_sc_rpc_msg hdr;
 	u32 val;
-} __packed;
+} __packed __aligned(4);
 
 /*
  * This function sets a miscellaneous control value.