Fix filelist issue with CPU MatMul

Resolves: COMPMID-6024
Signed-off-by: Viet-Hoa Do <viet-hoa.do@arm.com>
Change-Id: I210ca5577eeb0b2c91d959fc37dcc77b3847abb3
Reviewed-on: https://review.mlplatform.org/c/ml/ComputeLibrary/+/9517
Reviewed-by: Jakub Sujak <jakub.sujak@arm.com>
Comments-Addressed: Arm Jenkins <bsgcomp@arm.com>
Dynamic-Fusion: Ramy Elgammal <ramy.elgammal@arm.com>
Benchmark: Arm Jenkins <bsgcomp@arm.com>
Tested-by: Arm Jenkins <bsgcomp@arm.com>
diff --git a/Android.bp b/Android.bp
index cf2d457..bfc7474 100644
--- a/Android.bp
+++ b/Android.bp
@@ -178,6 +178,7 @@
                          "build/android-arm64v8a/src/core/CL",
                          "src/core/common",
                          "src/core/helpers",
+                         "src/core/NEON/kernels/arm_gemm",
                          "src/core/NEON/kernels/assembly",
                          "src/core/NEON/kernels/convolution/common",
                          "src/core/NEON/kernels/convolution/winograd",