dtsi: update to match new mdss

rename
qcom,mdss-dsi-te-v-sync-rd-ptr-irq-line to qcom,mdss-dsi-te-wr-mem-start
qcom,mdss-dsi-te-v-sync-continues-lines to qcom,mdss-dsi-te-wr-mem-continue

according to qcom mdss update

Signed-off-by: Alin Jerpelea <alin.jerpelea@sonymobile.com>