xpp: refactor the FXS module ring settings into separate data structure:
* Update High VBAT initialization in init_card_1_30:
- Take the value used in set_vm_led_mode() (0x34)
- Now we don't need to set it over and over again in set_vm_led_mode()
* Create a unified ring_parameters[] array for all ring registers:
- Columns for 3 ring types (NEON, TRAPEZ, NORMAL)
- Used by new send_ring_parameters() function
* Now the set_vm_led_mode() simply calls send_ring_parameters()
* This cleanup would allow us to change ring parameters at runtime (by
updating the values in these tables).
Signed-off-by: Tzafrir Cohen <tzafrir.cohen@xorcom.com>