apalis/colibri_t30: fix HDMI hang issue

Initialisation of the framebuffer console on DVI-D aka HDMI sometimes
failed. This was particularly bad on Apalis T30 where this is activated
by default. On Colibri T30 this was observed when enabling it using the
fbcon=map:1 boot argument.

This fix curtsey of Bibek Basu from NVIDIA explicitly enables PLLA
during early clock initialisation which avoids a later race with the
display driver on DC1.

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