A few MMU code fixes.

Added GPU reset code (unused because it works as is). Disabled tag RAM and L1 parity checking on ARM11. Don't rely on code overhead at SD card init for the 74 clock pulses. Implemented new cycle accurate delay function.

More code improvements/documentation.

Improved RSA code a bit. Now uses interrupts.

A few code optimizations.

Simplified MMU mappings a bit and added documentation which bits are which.

Updated SPI code. Added unused SPICARD code.

Fix for the HOME button workaround, other bugfixes and cleanup.

Fixed PXI bug introduced in previos PXI/IPC cleanup.

HID refactor.

Simplify CODEC code even more.

PXI, IPC and debug code cleanup.

Some PXI code cleanup.

[spiflash.c] Set offset directly instead of byte writes.

Minor fixes/adjustments to SPI code. Moved spiflash code to ARM11.

Added SPI and CODEC drivers. Unused right now.

Apply all fatfs patches released to date.

[ARM11] Disable FIQs properly.

Change power LED pattern to indicate sleep when the lid is closed.

Avoid a few stalls in iomemcpy().

Init PXI last and enable interrupts CPU side earlier to prevent hangs.

Re-enable code to set MCU IRQ bitmask.

Use iomemcpy() to copy bootroms and OTP.

Removed AES_subCounter() and replaced AES_addCounter() with optimized version.

[ARM11] Prevent possible UB with the MMU and enable icache a bit earlier.

Added SHA + NDMA prototype + some notes.

Fixed warning introduced in last commit.

Introducing iomemcpy() and iomemset().

config: make the parser more strict to avoid confusions.

Init screen if requested on FCRAM boots.