MIPS: Setup boot_command_line before plat_mem_setup

Platforms using DT will typically call __dt_setup_arch from
plat_mem_setup. This in turn calls early_init_dt_scan. When
CONFIG_CMDLINE is set, this leads to its value being copied into
boot_command_line by early_init_dt_scan_chosen. If this happens before
the code setting up boot_command_line in arch_mem_init runs, that code
will go on to append CONFIG_CMDLINE (via builtin_cmdline) to
boot_command_line again, duplicating it. For some command line
parameters (eg. earlycon) this can be a problem. Set up
boot_command_line before early_init_dt_scan_chosen gets called such that
it will not write CONFIG_CMDLINE in this scenario & the arguments aren't
duplicated.

Signed-off-by: Paul Burton <[email protected]>
Acked-by: Mathieu Malaterre <[email protected]>
Cc: Ralf Baechle <[email protected]>
Cc: Maarten ter Huurne <[email protected]>
Cc: [email protected]
Patchwork: https://patchwork.linux-mips.org/patch/18483/
Signed-off-by: James Hogan <[email protected]>

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