board-8064: Add boot param to enable MHL

This change extends the existing boot parameter that specifies
the external display to add the capability to enable the
MHL transmitter.

Change-Id: I062bb68c7b94bc0f84771f5fafe7208d0a362484
Signed-off-by: Aravind Venkateswaran <aravindh@codeaurora.org>
2 files changed