Staging: crystalhd: Misc improvements for crystalhd_lnx.c

This patch does following improvements:

1. Follow kernel style for comments
2. Reorganize code for readability improvement
3. Use PCI helper macros
4. Use __devinit, __devexit, __devexit_p at necessary places
5. Mark functions and data as static when it is not exported

Signed-off-by: Ameya Palande <2ameya@gmail.com>
Cc: Naren Sankar <nsankar@broadcom.com>
Cc: Jarod Wilson <jarod@wilsonet.com>
Cc: Scott Davilla <davilla@4pi.com>
Cc: Manu Abraham <abraham.manu@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>