PICO_DEOPTIMIZED_DEBUG breaks FLASH functions

[sysprogs]

Building the projects with the -DPICO_DEOPTMIZED_DEBUG=1 breaks several FLASH functions. The easiest way to reproduce it is to simply build the unique_board_id example with -DPICO_DEOPTMIZED_DEBUG=1. The code will crash with the following stack:

 	hw_write_masked
	flash_cs_force
 	flash_do_cmd
 	flash_get_unique_id
 	_retrieve_unique_id_on_boot
 	runtime_init
 	platform_entry

This happens because fully disabling GCC optimization also disables function inlining, so the FLASH-related functions that are supposed to run from RAM (e.g. flash_cs_force()) still end up calling functions from FLASH (e.g. hw_write_masked()).

This can be fully solved by declaring functions in address_mapped.h with __attribute__((always_inline)) instead of just inline, e.g.:

inline static void __attribute__((always_inline)) hw_write_masked(io_rw_32 *addr, uint32_t values, uint32_t write_mask) {
    hw_xor_bits(addr, (*addr ^ values) & write_mask);
}

[kilograham]

fixed by #379