arch/arm: Replace .id section with build_info in CBFS

For arch/arm[64], the offsets to board identification strings and
CONFIG_ROM_SIZE inside .id were never really used; it was only a
convenience to have the strings appear near the start of image.

Add the same strings in an uncompressed file in CBFS.

Change-Id: I35d3312336e9c66d657d2ca619cf30fd79e18fd4
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/47602
Reviewed-by: Arthur Heymans <arthur@aheymans.xyz>
Reviewed-by: Julius Werner <jwerner@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

src/lib/program.ld

@@ -15,9 +15,6 @@
 	_text = .;
 	*(.text._start);
 	*(.text.stage_entry);
-#if !ENV_X86 && (ENV_DECOMPRESSOR || ENV_BOOTBLOCK && !CONFIG(COMPRESS_BOOTBLOCK))
-	KEEP(*(.id));
-#endif
 	KEEP(*(.metadata_hash_anchor));
 	*(.text);
 	*(.text.*);