Change in coreboot[master]: Makefile.inc: Add x86 bootblock as a separate target

[Julius Werner (Code Review)]

Attention is currently required from: Martin Roth, Marshall Dawson, Arthur Heymans, Kyösti Mälkki, Yu-Ping Wu, Felix Held.
Julius Werner has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/56122 )

Change subject: Makefile.inc: Add x86 bootblock as a separate target
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Patch Set 14:

(3 comments)

File src/arch/x86/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/56122/comment/e2bc5e60_e7692a80 
PS9, Line 107: bootblock-options := $(TS_OPTIONS) $(TXTIBB)
> > Can't we just put the -b here as well (maybe if you use = instead of := )? Or is there no way to m […]

Thanks, I think that's cleaner.

File src/arch/x86/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/56122/comment/397feb9a_03cf900a 
PS11, Line 103: ifneq ($(CONFIG_UPDATE_IMAGE),y)
Shouldn't this also depend on TOP_ALIGNED_BOOTBLOCK? (And in that case maybe go in the arch-independent Makefile?)

https://review.coreboot.org/c/coreboot/+/56122/comment/4aebb9b0_7cc5edc9 
PS11, Line 106: 	-$(CBFSTOOL) $< remove -n bootblock 2>/dev/null
Why are we removing something first?