When sending security request for connection with pending high
security level, authentication requirements should indicate that
MITM is required.
< ACL Data TX: Handle 64 flags 0x00 dlen 6
SMP: Security Request (0x0b) len 1
Authentication requirement: Bonding, MITM, Legacy,
No Keypresses (0x05)
Change-Id: Ie78e021726063b0eee415bfa7189962fe0b2d94b
Signed-off-by: Szymon Janc <ext.szymon.janc@tieto.com>