vp9_reconintra_neon_asm/tm4x4: simplify left load
vp9_reconintra_neon_asm/tm4x4: simplify left load

use vld1.8 {d0[]}, [r0] rather than ldrb+vdup; mildly faster

Change-Id: Ia5ffc736bcb0f5497b7d9e55a93bf5a5f5f6928c

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