nspire: added bus disable for classics to prevent accidental NAND writes
nspire: merge with i2c branch
nspire: added boot parameter 'cx_use_otg' to choose usb mode for CX models
nspire: remove debugging from i2c
Merge remote-tracking branch 'upstream/nspire' into testing

Conflicts:
	arch/arm/mach-nspire/nspire_cx.c