qcom-common: Set timer_rate to 30000 for 8974

 * The default value is too fast and causes jitter

Change-Id: Ic25a07325f34fc18cd6b5e31494de045abe13b46
Merge branch 'cm-11.0' of github.com:CyanogenMod/android_device_samsung_qcom-common into cm-11.0