edid: Fix string extraction in Monitor Descriptors.

The ASCII Data String in EDID Monitor Descriptor (3.10.3) is "Stored as ASCII,
code page #437" and may contain special characters like '-'. The isalnum check
should be removed.

Also, the "Monitor Name" (0xfc) does not need to always end with 0Ah, so the
name_descriptor_terminated should be replaced by has_valid_string_termination.

Change-Id: I12a670237e12577fc971c0fbd9b2a61c82040ad3
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/193001
(cherry picked from commit 671f82fd5963e32e72d3886aa242cb3e8519f226)
Signed-off-by: Isaac Christensen <isaac.christensen@se-eng.com>
Reviewed-on: http://review.coreboot.org/6996
Tested-by: build bot (Jenkins)
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Ronald G. Minnich <rminnich@gmail.com>
1 file changed