Remove type from vmvn

datatype is optional for the instruction but clang refuses it.
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0489c/CIHIJIHC.html

It is still required when using an immediate.
http://infocenter.arm.com/help/index.jsp?topic=/com.arm.doc.dui0489c/CIHGGEEB.html

Change-Id: I0fae956c8c0fa3f97578ce80abea247f7fc88705

vp8/encoder/arm/neon/shortfdct_neon.asm

@@ -97,7 +97,7 @@ coeff
     vmlal.s16       q11, d6, d17    ; c1*2217 + d1*5352 + 12000
     vmlsl.s16       q12, d6, d16    ; d1*2217 - c1*5352 + 51000
 
-    vmvn.s16        d4, d4
+    vmvn            d4, d4
     vshrn.s32       d1, q11, #16    ; op[4] = (c1*2217 + d1*5352 + 12000)>>16
     vsub.s16        d1, d1, d4      ; op[4] += (d1!=0)
     vshrn.s32       d3, q12, #16    ; op[12]= (d1*2217 - c1*5352 + 51000)>>16
@@ -200,7 +200,7 @@ coeff
     vmlal.s16       q11, d27, d17   ; B[4]  = c1*2217 + d1*5352 + 12000
     vmlsl.s16       q12, d27, d16   ; B[12] = d1*2217 - c1*5352 + 51000
 
-    vmvn.s16        q14, q14
+    vmvn            q14, q14
 
     vshrn.s32       d1, q9, #16     ; A[4] = (c1*2217 + d1*5352 + 12000)>>16
     vshrn.s32       d3, q10, #16    ; A[12]= (d1*2217 - c1*5352 + 51000)>>16