bluetooth: host: Fix BT_LE_LOCAL_SUPPORTED_FEATURES_SIZE define

Fix BT_LE_LOCAL_SUPPORTED_FEATURES_SIZE define, as this was
not working correctly without brackets around
CONFIG_BT_LE_MAX_LOCAL_SUPPORTED_FEATURE_PAGE.

Also fix CONFIG_BT_LE_MAX_LOCAL_SUPPORTED_FEATURE_PAGE help,
as this was talking about remote featues, where this only
applies for local features.

Also update for new CONFIG_BT_CONN_DYNAMIC_CALLBACKS kconfig

Signed-off-by: Sean Madigan <sean.madigan@nordicsemi.no>