disp: msm: sde: program read pointer after configuring vsync_counter_en

Program the read pointer after configuring the tearcheck registers.
The read pointer register should be configured after VSYNC_COUNTER_EN
is set as per hw programming sequence.

Change-Id: I2fa1429798fab51d08091e74a33f1b1c4382eafe
Signed-off-by: Veera Sundaram Sankaran <quic_veeras@quicinc.com>
Signed-off-by: Akash Gajjar <quic_agajjar@quicinc.com>
(cherry picked from commit fce2fc595f1a9881255faa651e8d1b9e43cbf906)