arm: ipred: NEON implementation of dc/h/v prediction functions

                                        A73		A53
intra_pred_dc_128_w4_8bpc_c:		39.3		62
intra_pred_dc_128_w4_8bpc_neon:		19.5		50.9
intra_pred_dc_128_w8_8bpc_c:		96.6		119.8
intra_pred_dc_128_w8_8bpc_neon:		25.2		55.5
intra_pred_dc_128_w16_8bpc_c:		204.8		285.7
intra_pred_dc_128_w16_8bpc_neon:	56.6		71.2
intra_pred_dc_128_w32_8bpc_c:		446.4		465.4
intra_pred_dc_128_w32_8bpc_neon:	129.1		112.1
intra_pred_dc_128_w64_8bpc_c:		847.1		1429.9
intra_pred_dc_128_w64_8bpc_neon:	308.5		226.6
intra_pred_dc_left_w4_8bpc_c:		62.7		102.9
intra_pred_dc_left_w4_8bpc_neon:	38.2		77.2
intra_pred_dc_left_w8_8bpc_c:		129.7		178.2
intra_pred_dc_left_w8_8bpc_neon:	46.2		84.2
intra_pred_dc_left_w16_8bpc_c:		256.6		375.2
intra_pred_dc_left_w16_8bpc_neon:	84.6		102.8
intra_pred_dc_left_w32_8bpc_c:		513.4		572.3
intra_pred_dc_left_w32_8bpc_neon:	159.1		164
intra_pred_dc_left_w64_8bpc_c:		929.8		1557.8
intra_pred_dc_left_w64_8bpc_neon:	339.7		260.8
intra_pred_dc_top_w4_8bpc_c:		51.3		78
intra_pred_dc_top_w4_8bpc_neon:		28.6		61.5
intra_pred_dc_top_w8_8bpc_c:		113.7		148.8
intra_pred_dc_top_w8_8bpc_neon:		40.5		78.2
intra_pred_dc_top_w16_8bpc_c:		235.2		349.2
intra_pred_dc_top_w16_8bpc_neon:	79.9		91.4
intra_pred_dc_top_w32_8bpc_c:		516.2		577
intra_pred_dc_top_w32_8bpc_neon:	157.7		159.8
intra_pred_dc_top_w64_8bpc_c:		989.8		1634.2
intra_pred_dc_top_w64_8bpc_neon:	345.6		260
intra_pred_dc_w4_8bpc_c:		79.4		131.1
intra_pred_dc_w4_8bpc_neon:		48.5		103.2
intra_pred_dc_w8_8bpc_c:		153.5		227.3
intra_pred_dc_w8_8bpc_neon:		59.6		110
intra_pred_dc_w16_8bpc_c:		297.4		457.9
intra_pred_dc_w16_8bpc_neon:		154.6		131.4
intra_pred_dc_w32_8bpc_c:		608.1		701.3
intra_pred_dc_w32_8bpc_neon:		187.8		184.2
intra_pred_dc_w64_8bpc_c:		1562.1		1786.9
intra_pred_dc_w64_8bpc_neon:		364.2		325.1
intra_pred_h_w4_8bpc_c:		        175.2		341.6
intra_pred_h_w4_8bpc_neon:		22.7		54.5
intra_pred_h_w8_8bpc_c:		        334		617.3
intra_pred_h_w8_8bpc_neon:		30.5		65
intra_pred_h_w16_8bpc_c:		541.4		1002.1
intra_pred_h_w16_8bpc_neon:		70.7		116.4
intra_pred_h_w32_8bpc_c:		839.5		1567.9
intra_pred_h_w32_8bpc_neon:		157.4		178.5
intra_pred_h_w64_8bpc_c:		1173.1		2394.6
intra_pred_h_w64_8bpc_neon:		340.7		296
intra_pred_v_w4_8bpc_c:		        139.6		340.6
intra_pred_v_w4_8bpc_neon:		19.3		51.2
intra_pred_v_w8_8bpc_c:		        233.7		558.7
intra_pred_v_w8_8bpc_neon:		27.3		56.7
intra_pred_v_w16_8bpc_c:		401.8		1000.3
intra_pred_v_w16_8bpc_neon:		61.4		73.8
intra_pred_v_w32_8bpc_c:		546.3		1447.8
intra_pred_v_w32_8bpc_neon:		132.2		119.7
intra_pred_v_w64_8bpc_c:		833.6		1867
intra_pred_v_w64_8bpc_neon:		313.5		237.7