rockchip: rk3399-pinephone-pro: Sync DT from v6.8 and update defconfig

rockchip: rk3399-pinephone-pro: Sync DT from v6.8 and update defconfig

Sync rk3399-pinephone-pro device tree from Linux kernel v6.8.

Add SPI flash related node and options to support boot from SPI flash.

Remove REGULATOR_PWM=y, board does not use pwm-regulator compatible.

Add SYS_NS16550_MEM32=y to use readl/writel for serial console.

Remove SPL_TINY_MEMSET=y to use full memset in SPL.

Signed-off-by: Jonas Karlman <jonas@kwiboo.se>
Reviewed-by: Dragan Simic <dsimic@manjaro.org>
Reviewed-by: Kever Yang <kever.yang@rock-chips.com>