build/roms_helper: reset d521fca7, backport fixes

I keep getting random linker issues when running:

./build boot roms all

I think the issue lies somewhere in here, from when
I did that massive audit. So I'm undoing the audit
which mostly re-factored the code style here.

These changes are being backported:
f338697b build/boot/roms: Support removing microcode
941fbcbf run coreboot utils from own directory
f256ce98 build/boot/roms: say board name on stderr

I removed this change:
6d6bd5ee (the script now uses dedicated utils directory)

additionally:

cbutils is built much earlier on in the script, first
thing after initialising variables

the other changes not backported are all code style
changes, and I believe these are responsible.

if no other fixes occur to this fire before the next
libreboot release, then my hunch was right.

Signed-off-by: Leah Rowe <leah@libreboot.org>