rootfs_override: removed now-unused sfp_database.conf

Signed-off-by: Alessandro Rubini <rubini@gnudd.com>

userspace/rootfs_override/wr/etc/sfp_database.conf

--- The VENDOR_SERIAL field can be set to an empty string to provide class-level
--- information as opposed to device-level information.
-
-sfpdb = {
-  {
-    part_num = "AXGE-1254-0531",
-    alpha = 2.67871791665542e-04,
-    delta_tx = 10,
-    delta_rx = 10
-  },
-
-  {
-    part_num = "AXGE-3454-0531",
-    alpha = -2.67800055584799e-04,
-    delta_tx = 10,
-    delta_rx = 10
-  },
-  
-  
-  
-
-}

userspace/rootfs_override/wr/etc/wrsw_hal.conf

-global = {
-	sfp_database_path = "/wr/etc/sfp_database.conf";
-};
-
 timing =  {
 	pps_width = 100000; -- PPS pulse width
 --	use_nmea = 1; -- take UTC seconds from NMEA GPS clock connected to /dev/ttyS2