ARM: Use -mcpu=cortex-a15 when targeting MSM Krait CPUs

Borrowed from CM; original commit message:

    Enable compiler optimizations specific to the Cortex-A15
    processor when targeting MSM Krait CPUs. This is necessary
    take advantage of the UDIV/SDIV instructions supported by
    these processors. To accomplish this, we need to remove the
    -march=armv7-a ISA restriction from the compiler options
    because 'cortex-a15' is a superset of 'armv7-a'.

    Change-Id: I6215aecc11fb4f77c971de7b84f68649ef234357
    Signed-off-by: Stepan Moskovchenko <stepanm@codeaurora.org>
configs: strip drivers and enable SELinux
Makefile: clean up CFLAGS disaster
mpu: less verbose logging
i2c-qup: dangerous strippage; bugfix
cpufreq: clean up limit logging

- use signed limit for queued DVFS
- don't print garbage in msm_thermal