MGS-5035-1 [#ccc] enable shader clock frequency scaling

MGS-5035-1 [#ccc] enable shader clock frequency scaling

currently GPU core clock frequency scaling is enabled,
the scaled clock cannot change GPU shader frequency.

enable shader frequency scaling with below setting:

  fscaleSh_clkSh = clkSh[7 :1 ];
  fscaleShLoad_clkSh = clkSh [0 ];
  enableAutoSh_clkSh = clkSh[16 ];
  disableAuto_clkSh = clkSh[17 ];

trick: write 0x10C to set new frequency scaling,
reset 0x10C to lock-up it before next change.

Signed-off-by: Xianzhong <xianzhong.li@nxp.com>