Rename __attribute__((packed)) --> __packed

Also unify __attribute__ ((..)) to __attribute__((..)) and
handle ((__packed__)) like ((packed))

Change-Id: Ie60a51c3fa92b5009724a5b7c2932e361bf3490c
Signed-off-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Reviewed-on: https://review.coreboot.org/15921
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

util/cbfstool/lz4/lib/lz4.c

@@ -176,7 +176,7 @@ static void LZ4_write16(void* memPtr, U16 value) { *(U16*)memPtr = value; }
 
 /* __pack instructions are safer, but compiler specific, hence potentially problematic for some compilers */
 /* currently only defined for gcc and icc */
-typedef union { U16 u16; U32 u32; size_t uArch; } __attribute__((packed)) unalign;
+typedef union { U16 u16; U32 u32; size_t uArch; } __packed unalign;
 
 static U16 LZ4_read16(const void* ptr) { return ((const unalign*)ptr)->u16; }
 static U32 LZ4_read32(const void* ptr) { return ((const unalign*)ptr)->u32; }