[gta02-core] another Symbol: BT Module

[Werner Almesberger]

Hmm, there are a lot of changes to the pin naming style. I think
it's better to stay close to the data sheet (which is also what
Openmoko used, with the exception of VD_315). Besides, most of the
original names follow the convention for identifiers in the usual
programming languages, so anyone trying to use them in a program
or similar doesn't have to make another transliteration.

I've changed them as follows:

VDD(3.15)	-> VDD_3.15
VDD(1.8)	-> VDD_1.8
V_REG		-> VREG_IN
xxx(yyy)	-> xxx_yyy

Then, the SPI pins were all BiDi while the data sheets has them
unidirectional. I changed them accordingly.

Finally, I made XTAL_IN/OUT Input/Output, mainly for consistency
with how we use such pins elsewhere.

After that, I couldn't find anything else to bicker about ;-)

Thanks,
- Werner