cras: dsp: Removed unused C files

Remove the C files that have been completely ported into rust codes.
These C files have a copy in cras/src/dsp/c and are currently only used
for unit tests.

BUG=b:352433455
TEST=bazel test //...

Change-Id: I05d6a1d4bc41f6a48cd429db7f44298f4a93d97d
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/adhd/+/5815951
Reviewed-by: Li-Yu Yu <[email protected]>
Tested-by: [email protected] <[email protected]>
Auto-Submit: Nathan Lee <[email protected]>
Commit-Queue: Nathan Lee <[email protected]>

Author: Nathan Lee

cras/src/dsp/BUILD.bazel

@@ -54,17 +54,6 @@ cc_library(
     ],
 )
 
-cc_library(
-    name = "eq",
-    srcs = ["eq.c"],
-    hdrs = ["eq.h"],
-    visibility = ["//cras/benchmark:__pkg__"],
-    deps = [
-        ":biquad",
-        "@thesofproject_sof",
-    ],
-)
-
 cc_library(
     name = "eq2",
     srcs = ["eq2.c"],
@@ -113,18 +102,6 @@ cc_library(
     ],
 )
 
-cc_library(
-    name = "drc_kernel",
-    srcs = ["drc_kernel.c"],
-    hdrs = ["drc_kernel.h"],
-    linkopts = ["-lm"],
-    deps = [
-        ":drc_math",
-        "//cras/common:check",
-        "//cras/include",
-    ],
-)
-
 cc_library(
     name = "drc_math",
     srcs = ["drc_math.c"],