add support for custom sniff configuration

add support for custom sniff configuration

This change allows the bta_dm_pm_md table defined in bta_dm_cfg.c
to be overridden in bdroid_buildcfg.h

This also changes how the bta_dm_pm_spec table references sniff
parameters in the bta_dm_pm_md.  Indexing into the bta_dm_pm_md
table is now through an overrideable define instead of directly
referencing the index into the table.

Lastly this change allows for overriding the open, active, and
idle states of the HID host power table indepednent of the HID
device power table.

Bug: 13329024

Change-Id: If1eea95ebdd3efd48c69bf4cc6f2ffe06219c80b
Signed-off-by: Adam Hampson <ahampson@google.com>