devfreq: detect ddr type and add frequency table accordingly

Some targets support different DDR types. Detect the DDR type
and populate the frequency table accordingly. OPP framework
supports opp-supported-hw bit map which allows the selected
frequencies to be added to the opp table based on the hardware
version check. Implement the same in the bandwidth monitor device
so that the right frequencies would be added to the opp table.
This patch also adds checks for the latency based device to detect
the DDR type at runtime and add the corresponding frequency map.

Change-Id: Ice5a0b14da67b3f2f07e98bc7349220da7d4efdb
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>
Signed-off-by: Rama Aparna Mallavarapu <aparnam@codeaurora.org>