arm: mach-k3: Move DRAM address of ATF for AM62/AM62a

The current address of TF-A in DRAM is just below the 512MB address line.
This means if the DRAM in a system is 512MB then TF-A is right at the
end of memory which is often reused, for instance U-Boot relocates itself
here. If a system has less than 512MB then that system wouldn't work at
all as TF-A would fail to load.

To avoid the issues above, move TF-A to the start of DRAM, which doesn't
change from system to system.

As TF-A is position independent, this has no dependency on TF-A. We
also fixup DT as needed when TF-A address is moved, so this change also
has no dependency on Linux and is fully forward/backward compatible.

Signed-off-by: Andrew Davis <[email protected]>
Acked-by: Bryan Brattlof <[email protected]>

arch/arm/mach-k3/Kconfig

@@ -123,7 +123,7 @@ config SYS_K3_SPL_ATF
 
 config K3_ATF_LOAD_ADDR
 	hex "Load address of ATF image"
-	default 0x9e780000 if (SOC_K3_AM625 || SOC_K3_AM62A7)
+	default 0x80000000 if (SOC_K3_AM625 || SOC_K3_AM62A7)
 	default 0x70000000
 	help
 	  The load address for the ATF image. This value is used to build the