accel/amdxdna: Add missing include linux/slab.h

When compiling without CONFIG_IA32_EMULATION, there can be some errors:

drivers/accel/amdxdna/amdxdna_mailbox.c: In function ‘mailbox_release_msg’:
drivers/accel/amdxdna/amdxdna_mailbox.c:197:2: error: implicit declaration
of function ‘kfree’.
  197 |  kfree(mb_msg);
      |  ^~~~~
drivers/accel/amdxdna/amdxdna_mailbox.c: In function ‘xdna_mailbox_send_msg’:
drivers/accel/amdxdna/amdxdna_mailbox.c:418:11: error:implicit declaration
of function ‘kzalloc’.
  418 |  mb_msg = kzalloc(sizeof(*mb_msg) + pkg_size, GFP_KERNEL);
      |           ^~~~~~~

Add the missing include.

Fixes: b87f920b9344 ("accel/amdxdna: Support hardware mailbox")
Signed-off-by: Su Hui <[email protected]>
Reviewed-by: Lizhi Hou <[email protected]>
Reviewed-by: Jeffrey Hugo <[email protected]>
Signed-off-by: Lizhi Hou <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

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