Makefile: Install everything in scripts/
lpc43xx/uart: Uncomment register definitions
lpc43xx/uart: Kill _BITMASK definitions for single-bit fields
lpc43xx/uart: Fix TER register definition

I'm not sure why bit 7 was used previously. Revision 1.6 of UM10503
claims that the TXEN bit is bit 0 in all UART's TER registers.