dsp: add export symbol for adm_param_enable_v2

Export symbol is added for adm_param_enable_v2 function
so that it can be used by other modules.

Change-Id: I373bb91c014a669b16d5e578eeaa82f9aae39332
Signed-off-by: Vidyakumar Athota <vathota@codeaurora.org>