mesa: complete the GL_TEXTURE_SWIZZLE* setup

mesa: complete the GL_TEXTURE_SWIZZLE* setup

The ARB_texture_swizzle spec says:
    The error INVALID_OPERATION is generated if TexParameteri,
    TexParameterf, TexParameteriv, or TexParameterfv, parameter <pname>
    is TEXTURE_SWIZZLE_R, TEXTURE_SWIZZLE_G,  TEXTURE_SWIZZLE_B,
    or TEXTURE_SWIZZLE_A, and <param> is not RED, GREEN, BLUE, ALPHA,
    ZERO, or ONE.

    The error INVALID_OPERATION is generated if TexParameteriv, or
    TexParameterfv, parameter <pname> TEXTURE_SWIZZLE_RGBA, and the four
    consecutive values pointed to by <param> are not all RED, GREEN, BLUE,
    ALPHA, ZERO, or ONE.

So, the GL_TEXTURE_SWIZZLE* pname is legal for glTexParameterf(v)

NOTE: this is a candidate for the 7.11 branch

Signed-off-by: Yuanhan Liu <yuanhan.liu@linux.intel.com>
Reviewed-by: Brian Paul <brianp@vmware.com>