init_freemem sets up available regions of memory for the hardware that
seL4 is booting on. Previously this function was duplicated across
architectures, with minor duplication.
This change provides a top-level init_freemem suitable for all
architectures.
- arm/riscv: change get_avail_p_reg to return whole p_reg array
- update all architectures to use new init_freemem.
- wrap init_freemem calls with arch_init_freemem for each arch, where
arch_init_freemem sets up the available and reserved regions of memory
which are passed to init_freemem.
e3a83035f8