Rewrite the memory map-related code... ...

...other style fixes, etc.

Start implementing smcCpuSuspend

Merge pull request #51 from lioncash/const ...

memory_map: Remove unnecessary const

all: Make file-scope variables internally linked where applicable (#57) ...

Narrows the scope of visible symbols to where they're actually used. Also
makes it easier to see true globals in source files
(ones used from multiple translation units)

lock: Use stdatomic.h (#56) ...

Provides the same assembly output while using the standardized interface

e.g.

0000000000000000 <set_priv_smc_in_progress>:
   0:   90000000    adrp    x0, 0 <set_priv_smc_in_progress>
   4:   91000000    add x0, x0, #0x0
   8:   52800022    mov w2, #0x1                    // #1
   c:   d503201f    nop
  10:   085ffc01    ldaxrb  w1, [x0]
  14:   08037c02    stxrb   w3, w2, [x0]
  18:   35ffffc3    cbnz    w3, 10 <set_priv_smc_in_progress+0x10>
  1c:   72001c3f    tst w1, #0xff
  20:   54ffff81    b.ne    10 <set_priv_smc_in_progress+0x10>  // b.any
  24:   d65f03c0    ret

fuse: simplify checks in fuse_get_reserved_odm and fuse_get_spare_bit (#54) ...

A separate variable isn't particularly necessary here, and given that the type
is unsigned, we only need to test the upper bound.

This also resolves two -Wtype-limits warnings

mc: Remove dead code in get_carveout_by_id (#52)

se: Remove memset in se_perform_aes_block_operation (#53) ...

We can just initialize the array to be zeroed out. This is safer and less error-prone,
since the initializer is now associated with the variable directly, making it
impossible to put code relying on the zeroed out state before it (unlike with memset).

memory_map: Remove unnecessary const ...

Since the return value isn't a pointer thing doesn't have much use.

Failed attempt to fix loops not being unrolled, other fixes.

Move source files to src/, add Makefile, fix all build and linkage errors, etc.