dsp:q6asm: Resolve warning during compilation for static global function

Some functions in q6asm are declared as static and global with export_symbol
resulting in warning bring generated during compilation. Remove static from
functions to resolve issue.

Change-Id: I2c7be032278f956effc0d230a53fef5e02f771d7
Signed-off-by: Vatsal Bucha <vbucha@codeaurora.org>