firmware: coreboot: Remap RAM with memremap() instead of ioremap()

This is all system memory, so we shouldn't be mapping this all with
ioremap() as these aren't I/O regions. Instead, they're memory regions
so we should use memremap(). Pick MEMREMAP_WB so we can map memory from
RAM directly if that's possible, otherwise it falls back to
ioremap_cache() like is being done here already. This also nicely
silences the sparse warnings in this code and reduces the need to copy
anything around anymore.

Cc: Wei-Ning Huang <[email protected]>
Cc: Julius Werner <[email protected]>
Cc: Brian Norris <[email protected]>
Cc: Samuel Holland <[email protected]>
Signed-off-by: Stephen Boyd <[email protected]>
Reviewed-by: Julius Werner <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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