arm: mach-k3: Move MSMC fixup to SoC level

The MSMC fixup is something we do based on SoC, not based on the board.
So this fixup does not belong in the board files. Move this to the
mach-k3 common file so that it does not have to be done in each board
that uses these SoCs.

We use ft_system_setup() here instead of ft_board_setup() since it is no
longer board level. Enable OF_SYSTEM_SETUP in the configurations that use
this to keep functionality the same.

Signed-off-by: Andrew Davis <afd@ti.com>
Reviewed-by: Christian Gmeiner <christian.gmeiner@gmail.com>
diff --git a/configs/j721e_evm_a72_defconfig b/configs/j721e_evm_a72_defconfig
index 452e4b9..46ad1b7 100644
--- a/configs/j721e_evm_a72_defconfig
+++ b/configs/j721e_evm_a72_defconfig
@@ -29,6 +29,7 @@
 CONFIG_SPL_LOAD_FIT=y
 CONFIG_SPL_LOAD_FIT_ADDRESS=0x81000000
 CONFIG_OF_BOARD_SETUP=y
+CONFIG_OF_SYSTEM_SETUP=y
 CONFIG_DISTRO_DEFAULTS=y
 CONFIG_BOOTCOMMAND="run findfdt; run distro_bootcmd; run init_${boot}; run main_cpsw0_qsgmii_phyinit; run boot_rprocs; run get_kern_${boot}; run get_fdt_${boot}; run get_overlay_${boot}; run run_kern"
 CONFIG_LOGLEVEL=7