firmware: dmi_scan: add SBMIOS entry and DMI tables

firmware: dmi_scan: add SBMIOS entry and DMI tables

Orabug: 27023745

Some utils, like dmidecode and smbios, need to access SMBIOS entry
table area in order to get information like SMBIOS version, size, etc.
Currently it's done via /dev/mem. But for situation when /dev/mem
usage is disabled, the utils have to use dmi sysfs instead, which
doesn't represent SMBIOS entry and adds code/delay redundancy when direct
access for table is needed.

So this patch creates dmi/tables and adds SMBIOS entry point to allow
utils in question to work correctly without /dev/mem. Also patch adds
raw dmi table to simplify dmi table processing in user space, as
proposed by Jean Delvare.

Tested-by: Roy Franz <roy.franz@linaro.org>
Signed-off-by: Ivan Khoronzhuk <ivan.khoronzhuk@globallogic.com>
Signed-off-by: Jean Delvare <jdelvare@suse.de>
Signed-off-by: Dan Duval <dan.duval@oracle.com>
(cherry picked from commit d7f96f97c4031fa4ffdb7801f9aae23e96170a6f)
Reviewed-by: Jack Vogel <jack.vogel@oracle.com>
Conflict:

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