MLK-23751 clk: imx: Add audio PLL debug fs for K-divider monitor control

for userspace monitor control of the K-divider dynamically,
we provide two interfaces to userspace: delta_k & pll_parameter

1): delta_k is used to adjust the K divider in PLL based on small
    steps;
2): the pll_parameter interface is used for get PLL's current
    M-divider, P-divider, S-divider & K-divider setting in PLL register

example for the usage of these two interfaces:
A): Get the current PLL setting of dividers:
	root@imx8mmevk:~# cat /sys/kernel/debug/audio_pll_monitor/audio_pll1/pll_parameter
	Mdiv: 0x106; Pdiv: 0x2; Sdiv: 0x3; Kdiv: 0x24dd

B): if want to adjust the K-divider by a delta_k '1', then
	echo 0x1 > /sys/kernel/debug/audio_pll_monitor/audio_pll1/delta_k;

	root@imx8mmevk:~# cat /sys/kernel/debug/audio_pll_monitor/audio_pll1/pll_parameter
	Mdiv: 0x106; Pdiv: 0x2; Sdiv: 0x3; Kdiv: 0x24de

C): if want to adjust the K-divider by a delta_k '-1', then
	echo -1 > /sys/kernel/debug/audio_pll_monitor/audio_pll1/delta_k;

	root@imx8mmevk:~# cat /sys/kernel/debug/audio_pll_monitor/audio_pll1/pll_parameter
	Mdiv: 0x106; Pdiv: 0x2; Sdiv: 0x3; Kdiv: 0x24dc

Signed-off-by: Jacky Bai <ping.bai@nxp.com>
Reviewed-by: Anson Huang <Anson.Huang@nxp.com>

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