Get rid of BTM_IS_PUBLIC_BDA

One can't really guess address type based on last bits.
Instead, for new devices always assume public address.

Test: scan, toggle bluetooth, try connecting to device with public
      address
Bug: 74413120

Change-Id: Id558260798e717c214a5a817cea0c204c5f4858e
(cherry-picked from 8c2e78b44727789d641492beeef873b230c7e568)
(cherry picked from commit 14ef59e5a391a6dda7295ebe7d0d7c52875f76b0)
(cherry picked from commit c03c56afefe62f4e3761bc26c1f8b457dae3af3a)
diff --git a/stack/btm/btm_ble_bgconn.cc b/stack/btm/btm_ble_bgconn.cc
index f11a50e..f2f8307 100644
--- a/stack/btm/btm_ble_bgconn.cc
+++ b/stack/btm/btm_ble_bgconn.cc
@@ -209,11 +209,9 @@
   } else {
     /* not a known device, i.e. attempt to connect to device never seen before
      */
-    uint8_t addr_type =
-        BTM_IS_PUBLIC_BDA(bd_addr) ? BLE_ADDR_PUBLIC : BLE_ADDR_RANDOM;
     started = true;
     if (to_add)
-      background_connection_add(addr_type, bd_addr);
+      background_connection_add(BLE_ADDR_PUBLIC, bd_addr);
     else
       background_connection_remove(bd_addr);
   }
diff --git a/stack/btm/btm_ble_int_types.h b/stack/btm/btm_ble_int_types.h
index e7a4be3..b539211 100644
--- a/stack/btm/btm_ble_int_types.h
+++ b/stack/btm/btm_ble_int_types.h
@@ -85,13 +85,6 @@
   return ((x.address)[0] & BLE_RESOLVE_ADDR_MASK) == BLE_RESOLVE_ADDR_MSB;
 }
 
-#define BLE_PUBLIC_ADDR_MSB_MASK 0xC0
-/*  most significant bit, bit7, bit6 is 10 to be public address*/
-#define BLE_PUBLIC_ADDR_MSB 0x80
-inline bool BTM_IS_PUBLIC_BDA(const RawAddress& x) {
-  return ((x.address)[0] & BLE_PUBLIC_ADDR_MSB_MASK) == BLE_PUBLIC_ADDR_MSB;
-}
-
 /* LE scan activity bit mask, continue with LE inquiry bits */
 /* observe is in progress */
 #define BTM_LE_OBSERVE_ACTIVE 0x80