Update btstack 1.6.2 (raspberrypi#2202)

* Update btstack

v1.6.2 plus one commit

* Update bazel for btstack

* Build changes for btstack v1.6.2

Author: peterharperuk

MODULE.bazel

@@ -98,7 +98,7 @@ new_git_repository(
 new_git_repository(
     name = "btstack",
     build_file = "//src/rp2_common/pico_btstack:btstack.BUILD",
-    commit = "2b49e57bd1fae85ac32ac1f41cdb7c794de335f6",  # keep-in-sync-with-submodule: lib/btstack
+    commit = "501e6d2b86e6c92bfb9c390bcf55709938e25ac1",  # keep-in-sync-with-submodule: lib/btstack
     remote = "https://github.com/bluekitchen/btstack.git",
 )
 

lib/btstack

@@ -107,6 +107,13 @@ if (EXISTS ${PICO_BTSTACK_PATH}/${BTSTACK_TEST_PATH})
             ENABLE_BLE=1
             )
 
+    # Added in v1.6.2
+    if (EXISTS ${PICO_BTSTACK_PATH}/src/hci_event_builder.c)
+        target_sources(pico_btstack_ble INTERFACE
+            ${PICO_BTSTACK_PATH}/src/hci_event_builder.c
+        )
+    endif()
+
     pico_add_library(pico_btstack_classic)
     target_sources(pico_btstack_classic INTERFACE
         ${PICO_BTSTACK_PATH}/src/classic/a2dp.c
@@ -161,6 +168,13 @@ if (EXISTS ${PICO_BTSTACK_PATH}/${BTSTACK_TEST_PATH})
             ENABLE_CLASSIC=1
             )
 
+    # Added in v1.6.2
+    if (EXISTS ${PICO_BTSTACK_PATH}/src/classic/obex_srm_client.c)
+        target_sources(pico_btstack_classic INTERFACE
+            ${PICO_BTSTACK_PATH}/src/classic/obex_srm_client.c
+        )
+    endif()
+
     pico_add_library(pico_btstack_mesh)
     target_sources(pico_btstack_mesh INTERFACE
         ${PICO_BTSTACK_PATH}/src/mesh/adv_bearer.c