[SB][Sat] Add more signal strength logs; increase buffer size.

To get more details on b/337559250, incease the size of the buffer and
log when we register/unregister the signal strength callback.

Bug: 337559250
Test: dumped DeviceBasedSatelliteInputLog -> verified new log is there
Flag: ACONFIG com.android.internal.telephony.flags.oem_enabled_satellite_flag
NEXTFOOD

Change-Id: Ib02a1da2755b0ed4cfba2df070c5089ec5092a4e