system/main: Remove unused modules from shim

The following modules are not used in legacy:
  - ConnectabilityModule
  - DiscoverabilityModule
  - PageModule
  - ScanModule
  - InquiryModule

Remove accessors for querying these modules
in the stack manager

Bug: 333555245
Test: m com.android.btservices
Flag: EXEMPT, dead code removal
Change-Id: I7c67dbefefaa673cf0f90ccdcf49178e45353adc