bloblist: use correct types for physical addresses

bloblist: use correct types for physical addresses

It is expected that bloblists are stored in high memory beyond 2 GiB.
We must not use int as data type for these addresses but phys_addr_t.

Fixes: f9ef9fb033d5 ("bloblist: Handle alignment with a void entry")
Signed-off-by: Heinrich Schuchardt <heinrich.schuchardt@canonical.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>