feat(nxp-clk): add ARM PLL enablement

Add the low-level implementation to enable the ARM PLL oscillator, which
is disabled by default when booting the SoC. It will be used by PLL
diviers, for which support will be added later.

Change-Id: I964fa7374ea9a08c695009176eade01003c1d6c2
Signed-off-by: Ghennadi Procopciuc <ghennadi.procopciuc@nxp.com>
3 files changed