Fixes BLE HCI commands concurrency issue

Removes HCI LE Read Remote features command call
to prevent the concurrency between this command and
HCI LE start encryption command.

CRs-fixed: 517330

bug:11450568
Change-Id: I6445ab8095a4261c2a3f84acea1c546e6924f50d
Signed-off-by: Sunny Kapdi <sunnyk@codeaurora.org>