dtoverlays: Enable cam1_clock when using tc358743 or irs1125

This fixes a regression introduced in 131f1322
(see also https://github.com/raspberrypi/linux/issues/4791).
The tc358743 driver refused to bind to the device. The irs1125
driver is likely behaving similarly.

The new unified cam1_clk node that represents the fixed on-board
oscillator is marked as disabled by default. These overlays didn't
expect this and so the clock nodes were stuck in disabled state.

This commit just adds the required status = "okay" line. Other sensor
drivers do this too.