arm: mc: neon: Merge load and other related operations in blend/blend_h/blend_v functions

	                        A73		A53
	                Current	Earlier	Current	Earlier
blend_h_w2_8bpc_neon:	71.1	74.1	132.7	137.5
blend_h_w4_8bpc_neon:	60.2	65.8	137.5	147.1
blend_h_w8_8bpc_neon:	62.2	68.9	123.1	131.7
blend_h_w16_8bpc_neon:	82.1	86	180.7	190.3
blend_h_w32_8bpc_neon:	149.9	149.2	358.3	358
blend_h_w64_8bpc_neon:	265.3	263.1	630.2	629.8
blend_h_w128_8bpc_neon:	579.5	571	1404.4	1404.5
blend_v_w2_8bpc_neon:	118.7	118.7	193.2	195.3
blend_v_w4_8bpc_neon:	248.6	245.8	373.4	357.3
blend_v_w8_8bpc_neon:	202.7	202	356.4	357.2
blend_v_w16_8bpc_neon:	238.8	234.8	590.4	591.3
blend_v_w32_8bpc_neon:	346.7	344.4	993.7	994.7
blend_w4_8bpc_neon:	33.5	37.5	90.7	96.7
blend_w8_8bpc_neon:	49.7	53	123.3	123.3
blend_w16_8bpc_neon:	151.8	151	348.8	332.4
blend_w32_8bpc_neon:	372.9	370.9	908.3	908.4