fix PR15222, excessive LMA alignment

[Sebastian Huber]

This change can break linker command files that worked well before this change. 
  Example:

.data : {
	bsp_section_data_begin = .;
	*(SORT(.bsp_data*))
	*(.data .data.* .gnu.linkonce.d.*)
	SORT(CONSTRUCTORS)
} > REGION_DATA AT > REGION_DATA_LOAD
.data1 : {
	*(.data1)
} > REGION_DATA AT > REGION_DATA_LOAD
.sdata : {
	PROVIDE (_SDA_BASE_ = 32768);
	*(.sdata .sdata.* .gnu.linkonce.s.*)
	bsp_section_data_end = .;
} > REGION_DATA AT > REGION_DATA_LOAD
bsp_section_data_size = bsp_section_data_end - bsp_section_data_begin;
bsp_section_data_load_begin = LOADADDR (.data);
bsp_section_data_load_end = bsp_section_data_load_begin + bsp_section_data_size;

Assume that the .data, .data1 and .sdata have different alignment requirements 
and that regions REGION_DATA and REGION_DATA_LOAD are different.  The load area 
of the three sections is glued together with this change, but the runtime area 
has gaps between the sections due to the different alignment requirements.

Now a memcpy(bsp_section_data_begin, bsp_section_data_load_begin, 
bsp_section_data_size) no longer works.

How do we best address this problem?

1. Revert the change.
2. Select the behaviour depending on a command line or linker script option.
3. Require to fix the existing linker command files.

-- 
Sebastian Huber, embedded brains GmbH

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