msm: 8092: add clocks supplied by vcap

vcap hdmirx tmds clock and afe pixel clock are from external
input, but are sources for other clocks that are managed by
standard clock driver. This change hook these two input clocks
to clock framework.

Change-Id: I7d3b924b50b40e3a2e2b499d30c880bd3af34b61
Signed-off-by: Wentao Xu <wentaox@codeaurora.org>