x86: hevc_deblock: remove unnecessary masking

The unpacks/shuffles later on makes it unnecessary.

Before:
1508 decicycles in h, 2096759 runs, 393 skips
2512 decicycles in v, 2095422 runs, 1730 skips

After:
1477 decicycles in h, 2096745 runs, 407 skips
2484 decicycles in v, 2095297 runs, 1855 skips

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

libavcodec/x86/hevc_deblock.asm

@@ -355,19 +355,15 @@ ALIGN 16
     psrld            m8, 16
     paddw            m8, m10
     movd            r7d, m8
-    and              r7, 0xffff; 1dp0 + 1dp3
     pshufd           m8, m8, 0x4E
     movd            r8d, m8
-    and              r8, 0xffff; 0dp0 + 0dp3
 
     pshufd           m8, m11, 0x31
     psrld            m8, 16
     paddw            m8, m11
     movd            r9d, m8
-    and              r9, 0xffff; 1dq0 + 1dq3
     pshufd           m8, m8, 0x4E
     movd           r10d, m8
-    and             r10, 0xffff; 0dq0 + 0dq3
     ; end calc for weak filter
 
     ; filtering mask