Automatically reformat com32/lib/malloc.c using Nindent.

Do this for all files except HDT, gPXE and externally maintained
libraries (zlib, tinyjpeg, libpng).

Signed-off-by: H. Peter Anvin <hpa@zytor.com>

Merge the memory map discovery for malloc and the memory map discovery
for memmap into one file that scans memory and invokes a callback.

Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

Impact: should deal with memory holes more gracefully

Right now, if we find a memory hole, we simply don't use the memory
beyond that point.  This makes it possible for com32 modules to
use that memory.  After this, we should be able to add relocation
support to allow loading when the memory at 1 MB is unavailable.

Signed-off-by: H. Peter Anvin <hpa@zytor.com>