arm64: dts: ti: k3-am69-sk: Add phase tags marking

arm64: dts: ti: k3-am69-sk: Add phase tags marking

bootph-all as phase tag was added to dt-schema
(dtschema/schemas/bootph.yaml) to cover U-Boot challenges with DT.
That's why add it also to Linux to be aligned with bootloader requirement.

wkup_i2c0, mcu_uart0, main_uart8, main_sdhci0 and main_sdhci1 are required
for bootloader operation on TI K3 AM69-SK EVM. These IPs along with
pinmuxes need to be marked for all bootloader phases, hence add bootph-all
to these nodes in kernel dts.

Signed-off-by: Apurva Nandan <a-nandan@ti.com>
Reviewed-by: Udit Kumar <u-kumar1@ti.com>
Link: https://lore.kernel.org/r/20230811192030.3480616-4-a-nandan@ti.com
Signed-off-by: Nishanth Menon <nm@ti.com>