mm: Log name of the Heap to which the new region is being added

[gustavonihei]

Summary

This PR intends to improve the logging of mm_addregion function by informing the name of the Heap to which the new region is being added.

Impact

Increase in debug information, should not have any real impact.

Testing

esp32c3-devkit:knsh

Before

mm_initialize: Heap: name=Umem, start=0x3fc905ac size=322228
mm_addregion: Region 1: base=0x3fc90704 size=321872
up_allocate_kheap: Heap: start=3fc83068 end=3fc90000 size=53144
mm_initialize: Heap: name=Kmem, start=0x3fc83068 size=53144
mm_addregion: Region 1: base=0x3fc831c4 size=52784

###After

mm_initialize: Heap: name=Umem, start=0x3fc905ac size=322228
mm_addregion: [Umem] Region 1: base=0x3fc90704 size=321872
up_allocate_kheap: Heap: start=3fc83068 end=3fc90000 size=53144
mm_initialize: Heap: name=Kmem, start=0x3fc83068 size=53144
mm_addregion: [Kmem] Region 1: base=0x3fc831c4 size=52784