hpm: fix documentation string

Docu of HPM Get Component Property keyword

Signed-off-by: Heiko Thiery <heiko.thiery@kontron.com>
fru: Fix in Get FRU Inventory Area Size

Use the correct ipmilib funciton in Get FRU Inventory Area Size.

Signed-off-by: Heiko Thiery <heiko.thiery@kontron.com>
__init__: aardvark and lan open function

Add separate open function for the different interfaces:

- Open IPMI Aardvark Connection (totalphase I2C adapter)
- Open IPMI LAN Connection (RMCP using ipmitool)

Signed-off-by: Heiko Thiery <heiko.thiery@kontron.com>