[S] Change in coreboot[master]: security/vboot: Update build rules using x86 SHA extension

[Yu-Ping Wu (Code Review)]

Attention is currently required from: Raul Rangel, Kangheui Won, Julius Werner, Karthik Ramasubramanian.

Yu-Ping Wu has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/68953 )

Change subject: security/vboot: Update build rules using x86 SHA extension
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Patch Set 2:

(1 comment)

File src/security/vboot/Makefile.inc:

https://review.coreboot.org/c/coreboot/+/68953/comment/f5663758_2ba80a3c 
PS2, Line 26: ifeq ($(CONFIG_ARCH_VERSTAGE_X86_32)$(CONFIG_ARCH_VERSTAGE_X86_64),y)
> Sorry, maybe I'm confused, but isn't this the wrong way around? When verstage is x86 (top branch) yo […]

Build error from Jenkins:

```
arm-eabi-gcc: error: unrecognized command-line option '-mssse3'
```