pw_bluetooth_sapphire: Remove ReadInquiryScanTypeReturnParams

Remove packed struct definition of ReadInquiryScanTypeReturnParams
since it is no longer used.

Bug: b/42167863
Test: fx test //src/connectivity/bluetooth/core/bt-host
Reviewed-on: https://fuchsia-review.googlesource.com/c/fuchsia/+/1108696
GitOrigin-RevId: 1286f33587ca506270aaaffc41c5aef302351c13
Change-Id: I86f7caee148baa1bde0d97b573af35c1288af823
Reviewed-on: https://pigweed-review.googlesource.com/c/pigweed/pigweed/+/232754
Commit-Queue: Auto-Submit <auto-submit@pigweed-service-accounts.iam.gserviceaccount.com>
Pigweed-Auto-Submit: Jason Graffius <jgraff@google.com>
Reviewed-by: Ben Lawson <benlawson@google.com>
Lint: Lint 🤖 <android-build-ayeaye@system.gserviceaccount.com>

pw_bluetooth_sapphire/public/pw_bluetooth_sapphire/internal/host/hci-spec/protocol.h

@@ -366,14 +366,6 @@ constexpr OpCode kWriteSynchronousFlowControlEnable =
 // Read Inquiry Scan Type (v1.2) (BR/EDR)
 constexpr OpCode kReadInquiryScanType = ControllerAndBasebandOpCode(0x0042);
 
-struct ReadInquiryScanTypeReturnParams {
-  // See enum StatusCode in hci_constants.h.
-  StatusCode status;
-
-  // See enum class InquiryScanType in hci_constants.h for possible values.
-  InquiryScanType inquiry_scan_type;
-} __attribute__((packed));
-
 // ====================================
 // Write Inquiry Scan Type (v1.2) (BR/EDR)
 constexpr OpCode kWriteInquiryScanType = ControllerAndBasebandOpCode(0x0043);