freedreno/a6xx: bump varyings limit
GL_MAX_VARYING_COMPONENTS
is bumped to 124 since it should
not include the components of gl_Position
. (Same as in blob)
MAX_*_OUTPUT_COMPONENTS
is bumped to 128. (Same as in blob)
GL_MAX_VARYING_COMPONENTS
and MAX_*_OUTPUT_COMPONENTS
are required to be 128 since GL3.2.