Kconfig: add config options to enable s87cm tweaks and overclocking

s87cm tweaks will hold options to enable all of my custom tweaks,
such as overclocking (already defined), undervolting, and possibly
other kernel level tweaks.

NOTE - No code has been added yet!! These switches do nothing!!
       They have been added in preparation for the addition of these
       features.
cpufreq: Add initial oc code

This change enables overclocking only. It simply checks to see if
CONFIG_S87_OC_SUPP is defined, and if it is it adds 1674MHz step
to the frequency table. CONFIG_S87_OC_SUPP is defined in Kconfig.s87,
as added in a previous commit
Kconfig: fix derp in arch/arm/mach-msm/Kconfig.s87

Missing a quote (") symbol, causing a multi-line quote warning
defconfig: add s87cm tweaks and oc support config flags