raised page_alloc back to 65536kb + whatever android requests.
make hporch32 panel a configurable option.
minor errors spotted by smatch static analysis tool.
unified hporch32 into single panel file, and add poor man hotunplug to cpu1 when screen off, to save power.
experimental: wake_unlock() into spi_tty to save power.
Reduced extra_free_kbytes internal bloat to +16M instead of +64M. Will leave at this and any further tuning should be done by setprop sys.sysctl.extra_free_kbytes in android.