DPLL_CORE_M6_OPP100_RATE should be 266666666

Change-Id: Ia93c111a588255705536f30481487a77696a62e9
omap2plus-cpufreq: set transition latency to 30ms

Vishwanath says 30ms is best, so I'm gonna agree with him:
http://www.mail-archive.com/linaro-dev@lists.linaro.org/msg01373.html
omap2plus-cpufreq: allow throttling to start at current freq
arm: mach-omap2: add 230MHz as cpu slot freq

Signed-off-by: Humberto Borba <humberos@gmail.com>