fwd_txfm_neon.c: Remove unused aom_fdct8x8_1_neon

This function appears to not be called anywhere, so is removed.

Change-Id: I0bc24c2872456868c0cb2112a6c647413e05671f

aom_dsp/arm/fwd_txfm_neon.c

diff --git a/aom_dsp/arm/fwd_txfm_neon.c b/aom_dsp/arm/fwd_txfm_neon.c
index fb4cda7..a4d6322 100644
--- a/aom_dsp/arm/fwd_txfm_neon.c
+++ b/aom_dsp/arm/fwd_txfm_neon.c
@@ -302,20 +302,3 @@
     vst1q_s16(&final_output[7 * 8], input_7);
   }
 }
-
-void aom_fdct8x8_1_neon(const int16_t *input, int16_t *output, int stride) {
-  int r;
-  int16x8_t sum = vld1q_s16(&input[0]);
-  for (r = 1; r < 8; ++r) {
-    const int16x8_t input_00 = vld1q_s16(&input[r * stride]);
-    sum = vaddq_s16(sum, input_00);
-  }
-  {
-    const int32x4_t a = vpaddlq_s16(sum);
-    const int64x2_t b = vpaddlq_s32(a);
-    const int32x2_t c = vadd_s32(vreinterpret_s32_s64(vget_low_s64(b)),
-                                 vreinterpret_s32_s64(vget_high_s64(b)));
-    output[0] = vget_lane_s16(vreinterpret_s16_s32(c), 0);
-    output[1] = 0;
-  }
-}