counter: Add Renesas RZ/G2L MTU3a counter driver

Add RZ/G2L MTU3a counter driver. This IP supports the following
phase counting modes on MTU1 and MTU2 channels

1) 16-bit phase counting modes on MTU1 and MTU2 channels.
2) 32-bit phase counting mode by cascading MTU1 and MTU2 channels.

This patch adds 3 counter value channels.
	count0: 16-bit phase counter value channel on MTU1
	count1: 16-bit phase counter value channel on MTU2
	count2: 32-bit phase counter value channel by cascading
                MTU1 and MTU2 channels.

The external input phase clock pin for the counter value channels
are as follows:
	count0: "MTCLKA-MTCLKB"
	count1: "MTCLKA-MTCLKB" or "MTCLKC-MTCLKD"
	count2: "MTCLKA-MTCLKB" or "MTCLKC-MTCLKD"

Use the sysfs variable "external_input_phase_clock_select" to select the
external input phase clock pin and "cascade_counts_enable" to enable/
disable cascading of channels.

Signed-off-by: Biju Das <biju.das.jz@bp.renesas.com>
Reviewed-by: William Breathitt Gray <william.gray@linaro.org>
Acked-by: William Breathitt Gray <william.gray@linaro.org>
Signed-off-by: Lee Jones <lee@kernel.org>
Link: https://lore.kernel.org/r/20230330111632.169434-5-biju.das.jz@bp.renesas.com

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