stm32mp2: update register used by BL31 for boot parameter

Use the ARM64 kernel booting register settings, defined in Linux
documentation Documentation/arch/arm64/booting.rst:

 x0 = physical address of device tree blob (dtb) in system RAM.

so kernel can replace U-Boot in FIP without modification of BL31.

Use x0 for future TF-A version and keep x2 as fallback to be compatible
with previous version of TF-A BL31.

Signed-off-by: Patrick Delaunay <patrick.delaunay@foss.st.com>
Reviewed-by: Patrice Chotard <patrice.chotard@foss.st.com>

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