OMAP4: DPLL cascading: Tune cpufreq interactive governor

During DPLL cascading timer_rate of interactive timer should be
increased, otherwise interactive governor will try to put system
out of DPLL cascading very frequently

[Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>:
Ported and adapted to p-android-omap-3.0]

Change-Id: I99bd86a8277b75f3f985124372f1c1b02f7d5ff2
Signed-off-by: Nicole Chalhoub <n-chalhoub@ti.com>
Signed-off-by: Andrii Tseglytskyi <andrii.tseglytskyi@ti.com>

Conflicts:
	arch/arm/mach-omap2/dpll44xx.c