Improved sys access to LPTC registers

Advanced timing registers exposed to sys file system. Also accessor functions created in the driver.

Add write support for writeable registers in the sys filesystem.

echo nnn > /sys/kernel/gpstime/lptc/regname

nnn can be decimal 0xhex, 0octal, or 0bbinary.

referecne DCC doc T2000406 for register meanings