hostapd: Commands to configure vendor IE

Adding support/commands to modify Vendor IE.

1. Speed test value: The link metric(data rate) of mesh child and
root node

2. Hop count: Number of hops to reach the Root node.

The Google Vendor IE would be configured with the above values
when configured. Else the default value configured from hostapd.conf
file is used.

BUG=b:77487763
TEST=Verified the functionality with hostapd_cli commands
	set_speed_result <data rate in Mbps>
	set_hop_count <number of hops>

Change-Id: I0cd4612421f2491521426ec86690c70d37950f2e
Reviewed-on: https://chromium-review.googlesource.com/1010414
Commit-Ready: Ratheesh Selvakumar Pappa <ratheeshs@google.com>
Tested-by: Ratheesh Selvakumar Pappa <ratheeshs@google.com>
Reviewed-by: Srinivasa duvvuri <sduvvuri@google.com>
2 files changed