Add a sysprop for initiating PHYs in LE create ext connection

This patch adds a sysprop to configure whether LE 1M PHY is the
only one used as initiating PHY in a LE Extended Create Connection
request.

Bug: 260677740
Tag: #floss
Test: Manual test - pairing with BLE mouse
Change-Id: I33dbf4093390015a17bffb25eed841d2cc2ad20a
diff --git a/private/property_contexts b/private/property_contexts
index 823fa2f..933392f 100644
--- a/private/property_contexts
+++ b/private/property_contexts
@@ -504,6 +504,7 @@
 
 bluetooth.core.gap.le.privacy.enabled                u:object_r:bluetooth_config_prop:s0 exact bool
 bluetooth.core.gap.le.conn.min.limit                 u:object_r:bluetooth_config_prop:s0 exact int
+bluetooth.core.gap.le.conn.only_init_1m_phy.enabled  u:object_r:bluetooth_config_prop:s0 exact bool
 
 bluetooth.device.default_name                        u:object_r:bluetooth_config_prop:s0 exact string
 bluetooth.device.class_of_device                     u:object_r:bluetooth_config_prop:s0 exact string