hikey960: Remove hifi dsp support.

The hifi dsp support wasn't frequently used nor enabled by
default. Since we are moving binary firmware objects to the
vendor package, just remove the hifi dsp logic and firmware
all together.

Signed-off-by: John Stultz <john.stultz@linaro.org>
Change-Id: Iab65f73aa33e2777b8e06ac5b6e075e23ecbe8ae
145 files changed