scripts: add support for Sercomm PID

scripts: add support for Sercomm PID

This scripts creates Sercomm PID file. PID is necessary for the factory
images creation of variuos Sercomm-based devices (Beeline, Netgear,
Etisalat).

Size: 0x70
+-------+------+---------------+------------------+
| Start | Size | Value* (ASCII)| Description      |
+=======+======+===============+==================+
| 0x0   | 0x8  | 10100         | Hardware version |
+-------+------+---------------+------------------+
| 0x8   | 0x8  | 444245 (DBE)  | Hardware ID      |
+-------+------+---------------+------------------+
| 0x64  | 0x4  | 1002          | Software version |
+-------+------+---------------+------------------+
*for Beeline Smartbox GIGA

Signed-off-by: Mikhail Zhilkin <csharper2005@gmail.com>