Cr50: Remove private-cr51 from version string
Cr50: Remove private-cr51 from version string

We no longer depend on this directory, so there's no need to
include its sha1sum in the version string.

BUG=chrome-os-partner:54101
BRANCH=none
TEST=make buildall; try on Cr50 hardware

Before

> version
Chip:    g cr50 B2
Board:   0
RO_A:  * 0.0.9/0088a3eb
RO_B:    0.0.3/8fe06b9e
RW_A:  * 0.0.6/DEV/cr50_v1.1.5333-cca986c
RW_B:    0.0.6/DEV/cr50_v1.1.5334-115b338
Build:   0.0.6/DEV/cr50_v1.1.5333-cca986c
         private-cr51:v0.0.87-24457f2
         tpm2:v0.0.264-5e5aaa3
         cryptoc:v0.0.4-5319e83
         2016-09-16 21:59:31 wfrichar@wintermute.mt
>

After

> version
Chip:    g cr50 B2
Board:   0
RO_A:  * 0.0.9/0088a3eb
RO_B:    0.0.3/8fe06b9e
RW_A:    0.0.6/DEV/cr50_v1.1.5333-cca986c
RW_B:  * 0.0.6/DEV/cr50_v1.1.5334-36b2cee
Build:   0.0.6/DEV/cr50_v1.1.5334-36b2cee
         tpm2:v0.0.264-5e5aaa3
         cryptoc:v0.0.4-5319e83
         2016-09-19 17:48:17 wfrichar@wintermute.mtv.corp.google.com
>

Change-Id: I785dff86e6b970219da87c8674f2a324fa074987
Signed-off-by: Bill Richardson <129945214b1d548d8e49b6c29c43094f8c78057f@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/387238
Reviewed-by: Mary Ruthven <81380f3403fed74252e92df3ed012a1819ec6296@chromium.org>

coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec,coreboot/chrome-ec