ARM: dma-mapping: don't allow DMA mappings to be marked executable

DMA mapping permissions were being derived from pgprot_kernel directly
without using PAGE_KERNEL.  This causes them to be marked with executable
permission, which is not what we want.  Fix this.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
static int __init early_coherent_pool(char *p)
{
	atomic_pool.size = memparse(p, &p);
	return 0;
}

static int __init early_coherent_pool(char *p)
{
	atomic_pool.size = memparse(p, &p);
	return 0;
}
