Fix build error reported on armhf while preparing 6.1-rc5
for Debian.

iosm_ipc_protocol.c:244:36: error: passing argument 3 of
'dma_alloc_coherent' from incompatible pointer type.

Change phy_ap_shm type from phys_addr_t to dma_addr_t.

Fixes: faed4c6f ("net: iosm: shared memory protocol")
Reported-by: Bonaccorso Salvatore <carnil@debian.org>
Signed-off-by: M Chetan Kumar <m.chetan.kumar@linux.intel.com>
Signed-off-by: David S. Miller <davem@davemloft.net>