fusee: support low-voltage SDMMC mode

fusee: use full bus width and faster initial clock speed

[stage2] raw_mmc_dev.c: fix various bugs

[stage2] Make console.c manage the display, enable it only when needed

[stage2] Unstub rawmmcdev_write

[sdmmc] sdmmc_handle_cpu_transfer: handle unaligned buffers

Fix struct tegra_sdmmc definition ...

Definition errors were cancelling each other (for the most part)

[sdmmc] Fix const-correctness issue

Use latest sdmmc driver in stage2

Add raw_mmc_dev (untested!)

Rename g_devices to g_fsdev_devices

Rewrite condition in fsdev_seek

Refine error in fsdev_mount_device

Make stdout line-buffered

Fix FindDevice and RemoveDevice calls in fs_dev.c

O_RDONLY is 0

Rewrite package2.c

Change the allocation logic in stratosphere.c

Refactor stage1's and stage2's main.c files

Don't deinit the display yet, for now

Fix bug in crt0

Make di.c accept arbitrary FB addresses, fix flickering issues

[stage2] Forgot to change that, too

Fix faulty IRAM check in check_32bit_address_range_in_program

Fix inverted condition issue in check_32bit_address_range_loadable

[stage1] Fix DEFAULT_BCT0_FOR_DEBUG

Rewrote crt0, init, and chainloading code ...

start.s, init.c, linker.ld and linker.specs are meant
to be re-used by user applications, should they remove the defines
from init.c and the .chainloader* sections from the linker script

Simplify fsdev_set_default_device

Fix warning/error, etc. in fs_dev.c

Fix fsdev_set_default_device bug