Revert "iommu/io-pgtable-arm: Check for v7s-incapable systems"

This reverts commit 82db33dc5e49fb625262d81125625d07a0d6184e.

After the commit 29859aeb8a6e ("iommu/io-pgtable-arm-v7s: Abort
allocation when table address overflows the PTE"), v7s will return fail
if the page table allocation isn't expected. this PHYS_OFFSET check
is unnecessary now.

And this check may lead to fail. For example, If CONFIG_RANDOMIZE_BASE
is enabled, the "memstart_addr" will be updated randomly, then the
PHYS_OFFSET may be random.

Reported-by: CK Hu <[e-mail]>
Signed-off-by: Yong Wu <[e-mail]>
Reviewed-by: Robin Murphy <[e-mail]>
Signed-off-by: Joerg Roedel <[e-mail]>

drivers/iommu/io-pgtable-arm-v7s.c

···
 {
 	struct arm_v7s_io_pgtable *data;
 
-#ifdef PHYS_OFFSET
-	if (upper_32_bits(PHYS_OFFSET))
-		return NULL;
-#endif
 	if (cfg->ias > ARM_V7S_ADDR_BITS || cfg->oas > ARM_V7S_ADDR_BITS)
 		return NULL;