bt: Fix sizeof-pointer-memaccess warning

This patch fixes wrong memcpy size when copying ltk value to
HCI_OP_LE_LTK_REPLY command.

Change-Id: I44e5e3da15369d4b424581720ccd3bac820ef2e0
Signed-off-by: Chet Kener <Cl3Kener@gmail.com>
block: update scheds upstream

Signed-off-by: Chet Kener <Cl3Kener@gmail.com>