memblock tests: add top-down NUMA tests for memblock_alloc_exact_nid_raw

Add tests for memblock_alloc_exact_nid_raw() where the simulated physical
memory is set up with multiple NUMA nodes. Additionally, all of these
tests set nid != NUMA_NO_NODE. These tests are run with a top-down
allocation direction.

The tested scenarios are:

Range unrestricted:
- region can be allocated in the specific node requested:
+ there are no previously reserved regions
+ the requested node is partially reserved but has enough space

Range restricted:
- region can be allocated in the specific node requested after dropping
min_addr:
+ range partially overlaps with two different nodes, where the
first node is the requested node
+ range partially overlaps with two different nodes, where the
requested node ends before min_addr
+ range overlaps with multiple nodes along node boundaries, and
the requested node ends before min_addr

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Rebecca Mckeever <remckee0@gmail.com>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/2cc0883243d68ddc3faf833d2d9e86f48534c1d7.1667802195.git.remckee0@gmail.com

memblock tests: introduce range tests for memblock_alloc_exact_nid_raw

Add TEST_F_EXACT flag, which specifies that tests should run
memblock_alloc_exact_nid_raw(). Introduce range tests for
memblock_alloc_exact_nid_raw() by using the TEST_F_EXACT flag to run the
range tests in alloc_nid_api.c, since memblock_alloc_exact_nid_raw() and
memblock_alloc_try_nid_raw() behave the same way when nid = NUMA_NO_NODE.

Rename tests and other functions in alloc_nid_api.c by removing "_try".
Since the test names will be displayed in verbose output, they need to
be general enough to refer to any of the memblock functions that the
tests may run.

Acked-by: David Hildenbrand <david@redhat.com>
Signed-off-by: Rebecca Mckeever <remckee0@gmail.com>
Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
Link: https://lore.kernel.org/r/5a4b6d1b6130ab7375314e1c45a6d5813dfdabbd.1667802195.git.remckee0@gmail.com