Fix dualcore startup
This MR includes:
- a workaround for a hardware bug with cache initialization
- fix of `#if CONFIG_WIFI_ENABLED` block in cpu_start.c for the case when WiFi is disabled.
- removal of miscellaneous delays in cpu_start.c
See merge request !22
This is a workaround for a hardware bug with cache initialization.
Only two lines of code related to DPORT_APP_CACHE_MMU_IA_CLR were added around mmu_init(1); call,
and two lines at the end of comment block.
I reformatted surrounding lines to use spaces for indentation, like the rest of the code in this file does.
