[S] Change in coreboot[main]: libpayload: Fix the stack and data labels

[Julius Werner (Code Review)]

Attention is currently required from: Yi Chou, Yu-Ping Wu.

Julius Werner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/79144?usp=email )

Change subject: libpayload: Fix the stack and data labels
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Patch Set 3:

(2 comments)

File payloads/libpayload/arch/arm/libpayload.ldscript:

https://review.coreboot.org/c/coreboot/+/79144/comment/0e83aa12_4dab63a8 :
PS3, Line 50: 		*(.rodata.*)
Can we just add `_text`/`_etext`, `_rodata`/`_erodata` and `_bss`/`_ebss` everywhere here as well for consistency?

https://review.coreboot.org/c/coreboot/+/79144/comment/d7e88f1c_5a5b4d42 :
PS3, Line 77: 		_stack = .;
Be careful, these are actually used, so you need to fix the references in the relevant assembly files as well (the three `arch/<arch>/head.S`).