devfreq: detect ddr type and add frequency table accordingly

Trinket target support LPDDR3 and LPDDR4 HW supporting different
frequency levels, update devfreq drivers to detect the DDR type
and add frequency tables accordingly.

Change-Id: I5286466274a3e96739b1feecdaccc9bea773d2b8
Signed-off-by: Santosh Mardi <gsantosh@codeaurora.org>