NFC: remove clk controll support for msm based nfc clocks

We are removing the clk controll feature for msm based NFC-clock sources.
This feature used the gpio mux to controll the NFC clock. The gpiomux
api is not supported in the 3.10 kernel.  Therefore we need to remove this
feature pending the need for a pincntrl solution.

Change-Id: I95dfa1ca4ad903830c632e105c1c93bd094b50a7
Signed-off-by: Houston Hoffman <hhoffman@codeaurora.org>