soc/fsl/qbman: use ioremap_cache() instead of ioremap_prot(0)

ioremap_prot() with flag set to 0 relies on a hack in
__ioremap_caller() which adds PAGE_KERNEL flags when the
handed flags don't look like a valid set of flags
(ie don't include _PAGE_PRESENT)

The intention being to map cached memory, use ioremap_cache() instead.
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

drivers/soc/fsl/qbman/qman_ccsr.c

@@ -418,7 +418,7 @@ static size_t fqd_sz, pfdr_sz;
 static int zero_priv_mem(phys_addr_t addr, size_t sz)
 {
 	/* map as cacheable, non-guarded */
-	void __iomem *tmpp = ioremap_prot(addr, sz, 0);
+	void __iomem *tmpp = ioremap_cache(addr, sz);
 
 	if (!tmpp)
 		return -ENOMEM;